| **Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions**                            | 12 Months Ended         |
|------------------------------------------------------------------------------------------------------------------|-------------------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Number of share-based compensation plans | plan                                                                  | 1                       |   |   |
| Number of shares authorized | shares                                                                             | 13,118,430              |   |   |
| Capitalization of stock based compensation expense                                                               | $ 0.0                   |   |   |
| Fair value of options vested during the period                                                                   | 4.1                     | $ 3.8 | $ 3.2 |
| Stock options                                                                                                    |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Proceeds from stock options exercised                                                                            | 6.8                     | 0.7 | 0.3 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 3.5                     | 0.7 |   |
| Unrecognized compensation expense                                                                                | $ 1.7                   |   |   |
| Weighted average years expense to be recognized over                                                             | 9 months 30 days        |   |   |
| Stock-settled stock appreciation rights                                                                          |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares         | 0                       |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 2.9                   | $ 2.0 | $ 3.6 |
| Stock Options and SSARs                                                                                          |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares         | 4,133,874               | 5,583,531 |   |
| Award vesting period                                                                                             | 3 years                 |   |   |
| RSUs                                                                                                             |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Unrecognized compensation expense                                                                                | $ 3.6                   |   |   |
| Weighted average years expense to be recognized over                                                             | 1 year 7 months 26 days |   |   |
| Shares outstanding | shares                                                                                      | 1,910,669               | 2,007,127 |   |
| Weighted average grant date fair value | $ / shares                                                              | $ 8.05                  | $ 7.58 | $ 6.12 |
| Fair value of stock awards vested                                                                                | $ 5.2                   | $ 10.3 | $ 3.2 |
| PSUs                                                                                                             |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Unrecognized compensation expense                                                                                | $ 10.1                  |   |   |
| Weighted average years expense to be recognized over                                                             | 1 year 8 months 6 days  |   |   |
| Shares outstanding | shares                                                                                      | 4,281,792               | 3,197,735 |   |
| Weighted average grant date fair value | $ / shares                                                              | $ 7.65                  | $ 7.52 | $ 6.14 |
| Fair value of stock awards vested                                                                                | $ 8.1                   | $ 5.4 | $ 4.4 |
| Share-based Compensation, Equity Instruments Other than Options, Shares Called upon Vested | shares              | 1                       |   |   |
| Minimum | RSUs                                                                                                   |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Award vesting period                                                                                             | 3 years                 |   |   |
| Minimum | PSUs                                                                                                   |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Award vesting period                                                                                             | 3 years                 |   |   |
| Percentage awarded                                                                                               | 0.00%                   |   |   |
| Maximum | Stock Options and SSARs                                                                                |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Exercise period                                                                                                  | 7 years                 |   |   |
| Maximum | PSUs                                                                                                   |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Percentage awarded                                                                                               | 150.00%                 |   |   |
| Fully Vested On The Grant Date | RSUs | Non-employee directors                                                   |                    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                               |                    |   |   |
| Share-based compensation expense, shares that vests on grant date                                                | $ 0.9                   | $ 0.8 | $ 0.8 |

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| - Definition
Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
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| - Definition
Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.
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Unrecognized cost of unvested share-based compensation awards.
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| - Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| - Definition
Number of equity instruments other than options outstanding, including both vested and non-vested instruments.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).
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| - Definition
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 options outstanding, including both vested and non-vested options.
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| - Definition
Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.
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