| **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         |                           |                |                                 |           |                     |
| Net income                                                                                                            | 85.4    |         |                           | 85.4                |                                 |           |                     |
| Net income attributable to nonredeemable noncontrolling interest                                                      | 27.4    |         |                           |                |                                 |           | 27.4                     |
| Net income, including portion attributable to nonredeemable noncontrolling interest, total                            | 112.8   |         |                           |                |                                 |           |                     |
| Conversion of preferred stock, shares                                                                                 |    | 3.3          |                           |                |                                 |           |                     |
| Conversion of preferred stock                                                                                         | 93.2    |         | 93.2                           |                |                                 |           |                     |
| Receipt of treasury stock                                                                                             | (16.6)  |         |                           |                |                                 | (16.6)         |                     |
| Receipt of treasury stock, Shares                                                                                     |    | (0.5)        |                           |                |                                 |           |                     |
| Dividends declared on common stock                                                                                    | (38.0)  |         | (38.0)                         |                |                                 |           |                     |
| Dividends declared on convertible perpetual preferred stock                                                           | (1.6)   |         | (1.6)                          |                |                                 |           |                     |
| Stock-based compensation                                                                                              | 14.9    |         | 14.9                           |                |                                 |           |                     |
| Stock options exercised                                                                                               | 2.0     |         | 5.6                            |                |                                 | (3.6)          |                     |
| Stock options exercised, Shares                                                                                       |    | 0.2          |                           |                |                                 |           |                     |
| Distributions declared                                                                                                | (23.4)  |         |                           |                |                                 |           | (23.4)                   |
| Capital contributions from consolidated affiliates                                                                    | 8.6     |         |                           |                |                                 |           | 8.6                      |
| Fair value adjustments to redeemable noncontrolling interests, net of tax                                             | (6.8)   |         | (6.8)                          |                |                                 |           |                     |
| Other                                                                                                                 | 0.1     | $ 0.1        | 0.6                            | (0.2)               | 0.2                                  | (0.5)          | (0.1)                    |
| Other, Shares                                                                                                         |    | 0.7          |                           |                |                                 |           |                     |
| Balance at end of period at Jun. 30, 2015                                                                             | 764.7   | $ 1.1        | 2,878.4                        | (1,793.9)           | (0.3)                                | (479.4)        | 158.8                    |
| Balance at end of period, Shares at Jun. 30, 2015                                                                     |    | 91.5         |                           |                |                                 |           |                     |
| 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         |                           |                |                                 |           |                     |
| Net income                                                                                                            | 120.6   |         |                           | 120.6               |                                 |           |                     |
| Net income attributable to nonredeemable noncontrolling interest                                                      | 29.8    |         |                           |                |                                 |           | 29.8                     |
| Net income, including portion attributable to nonredeemable noncontrolling interest, total                            | 150.4   |         |                           |                |                                 |           |                     |
| Receipt of treasury stock                                                                                             | (9.9)   |         |                           |                |                                 | (9.9)          |                     |
| Receipt of treasury stock, Shares                                                                                     |    | (0.4)        |                           |                |                                 |           |                     |
| Dividends declared on common stock                                                                                    | (41.7)  |         | (41.7)                         |                |                                 |           |                     |
| Stock-based compensation                                                                                              | 11.5    |         | 11.5                           |                |                                 |           |                     |
| Stock options exercised                                                                                               | 0.7     |         | 5.4                            |                |                                 | (4.7)          |                     |
| Stock options exercised, Shares                                                                                       |    | 0.2          |                           |                |                                 |           |                     |
| Distributions declared                                                                                                | (29.9)  |         |                           |                |                                 |           | (29.9)                   |
| Capital contributions from consolidated affiliates                                                                    | 7.6     |         |                           |                |                                 |           | 7.6                      |
| Fair value adjustments to redeemable noncontrolling interests, net of tax                                             | 2.8     |         | 2.8                            |                |                                 |           |                     |
| Repurchases of common stock                                                                                           | (24.1)  |         |                           |                |                                 | (24.1)         |                     |
| Repurchases of common stock, Shares                                                                                   |    | (0.7)        |                           |                |                                 |           |                     |
| Other                                                                                                                 | 2.7     |         | 1.7                            |                | 0.3                                  | (0.6)          | 1.3                      |
| Other, Shares                                                                                                         |    | 0.6          |                           |                |                                 |           |                     |
| Balance at end of period at Jun. 30, 2016                                                                             | $ 849.4 | $ 1.1        | $ 2,814.6                      | $ (1,575.4)         | $ (0.9)                              | $ (566.7)      | $ 176.7                  |
| Balance at end of period, Shares at Jun. 30, 2016                                                                     |    | 89.8         |                           |                |                                 |           |                     |

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Number of shares issued for each share of convertible preferred stock that is converted.
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The gross value of stock issued during the period upon the conversion of convertible preferred stock.
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Number of common stock shares reacquired during the period and currently held in treasury.
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Value of common stock reacquired during the period and currently held in treasury.
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Equity impact of the cost of common stock that were repurchased during the period. Recorded using the cost method.
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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".
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| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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| - Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.
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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.
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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.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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| - Definition
Portion of net income (loss) attributable to nonredeemable noncontrolling interest.
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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.
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| - Definition
Total contributions made by each class of partners (i.e., general, limited and preferred partners).
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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
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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.
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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.
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This element represents movements in the number of shares included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
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No definition available.
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| - Definition
Number of shares that have been repurchased during the period and are being held in treasury.
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