| **Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions** | Total   | Common Stock | Capital in Excess of Par Value | Accumulated Deficit | Accumulated Other Comprehensive Loss | Treasury Stock | Noncontrolling Interests |
|-----------------------------------------------------------------------------------------------------------------------|---------|--------------|--------------------------------|---------------------|--------------------------------------|----------------|--------------------------|
| Balance at beginning of period at Dec. 31, 2014                                                                       | $ 619.5 | $ 1.0        | $ 2,810.5                      | $ (1,879.1)         | $ (0.5)                              | $ (458.7)      | $ 146.3                  |
| Balance at beginning of period (shares) at Dec. 31, 2014                                                              |    | 87.8         |                           |                |                                 |           |                     |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                        |    |         |                           |                |                                 |           |                     |
| Net income                                                                                                            | 176.9   |         |                           | 136.1               |                                 |           | 40.8                     |
| Conversion of preferred stock                                                                                         | 93.2    |         | 93.2                           |                |                                 |           |                     |
| Conversion of preferred stock (shares)                                                                                |    | 3.3          |                           |                |                                 |           |                     |
| Receipt of treasury stock                                                                                             | (17.2)  |         |                           |                |                                 | (17.2)         |                     |
| Receipt of treasury stock (shares)                                                                                    |    | (0.6)        |                           |                |                                 |           |                     |
| Dividends declared on common stock                                                                                    | (59.1)  |         | (59.1)                         |                |                                 |           |                     |
| Dividends declared on convertible perpetual preferred stock                                                           | (1.6)   |         | (1.6)                          |                |                                 |           |                     |
| Stock-based compensation                                                                                              | 19.0    |         | 19.0                           |                |                                 |           |                     |
| Stock options exercised                                                                                               | 2.2     |         | 6.6                            |                |                                 | (4.4)          |                     |
| Stock options exercised (shares)                                                                                      |    | 0.2          |                           |                |                                 |           |                     |
| Distributions declared                                                                                                | (36.7)  |         |                           |                |                                 |           | (36.7)                   |
| Capital contributions from consolidated affiliates                                                                    | 9.5     |         |                           |                |                                 |           | 9.5                      |
| Fair value adjustments to redeemable noncontrolling interests, net of tax                                             | (14.9)  |         | (14.9)                         |                |                                 |           |                     |
| Other                                                                                                                 | (0.6)   | $ 0.1        | 1.6                            | 0.0                 | (0.6)                                | (1.6)          | (0.1)                    |
| Other (shares)                                                                                                        |    | 0.7          |                           |                |                                 |           |                     |
| Balance at end of period at Sep. 30, 2015                                                                             | 790.2   | $ 1.1        | 2,855.3                        | (1,743.0)           | (1.1)                                | (481.9)        | 159.8                    |
| Balance at end of period (shares) at Sep. 30, 2015                                                                    |    | 91.4         |                           |                |                                 |           |                     |
| Balance at beginning of period at Dec. 31, 2015                                                                       | 779.3   | $ 1.1        | 2,834.9                        | (1,696.0)           | (1.2)                                | (527.4)        | 167.9                    |
| Balance at beginning of period (shares) at Dec. 31, 2015                                                              |    | 90.1         |                           |                |                                 |           |                     |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                        |    |         |                           |                |                                 |           |                     |
| Net income                                                                                                            | 224.8   |         |                           | 182.3               |                                 |           | 42.5                     |
| Receipt of treasury stock                                                                                             | (9.9)   |         |                           |                |                                 | (9.9)          |                     |
| Receipt of treasury stock (shares)                                                                                    |    | (0.4)        |                           |                |                                 |           |                     |
| Dividends declared on common stock                                                                                    | (63.4)  |         | (63.4)                         |                |                                 |           |                     |
| Stock-based compensation                                                                                              | 16.1    |         | 16.1                           |                |                                 |           |                     |
| Stock options exercised                                                                                               | 1.8     |         | 6.6                            |                |                                 | (4.8)          |                     |
| Stock options exercised (shares)                                                                                      |    | 0.3          |                           |                |                                 |           |                     |
| Distributions declared                                                                                                | (43.1)  |         |                           |                |                                 |           | (43.1)                   |
| Capital contributions from consolidated affiliates                                                                    | 17.0    |         |                           |                |                                 |           | 17.0                     |
| Fair value adjustments to redeemable noncontrolling interests, net of tax                                             | 10.2    |         | 10.2                           |                |                                 |           |                     |
| Repurchases of common stock in open market                                                                            | (24.1)  |         |                           |                |                                 | (24.1)         |                     |
| Repurchases of common stock in open market (shares)                                                                   |    | (0.7)        |                           |                |                                 |           |                     |
| Other                                                                                                                 | 5.1     |         | 2.4                            |                | 0.2                                  | (0.7)          | 3.2                      |
| Other (shares)                                                                                                        |    | 0.5          |                           |                |                                 |           |                     |
| Balance at end of period at Sep. 30, 2016                                                                             | $ 913.8 | $ 1.1        | $ 2,806.8                      | $ (1,513.7)         | $ (1.0)                              | $ (566.9)      | $ 187.5                  |
| Balance at end of period (shares) at Sep. 30, 2016                                                                    |    | 89.8         |                           |                |                                 |           |                     |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total contributions made by each class of partners (i.e., general, limited and preferred partners).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares issued during the period as a result of the conversion of convertible securities.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The gross value of stock issued during the period upon the conversion of convertible securities.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
+ Details**Name:**us-gaap_StockholdersEquityOther**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of increase (decrease) in shares of stock classified as other.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770
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