| **Stock-Based Compensation (Share-based Compensation Expense) (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                |           |           |   |   |
| Stock-based compensation expense (income)                                                         | $ 0.9          | $ (1.2)        | $ 6.3 | $ 6.0 |
| Stock options                                                                                     |           |           |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                |           |           |   |   |
| Stock-based compensation expense (income)                                                         | 0.7            | 0.5            | 2.0 | 1.5 |
| Restricted stock units                                                                            |           |           |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                |           |           |   |   |
| Stock-based compensation expense (income)                                                         | 1.2            | 0.8            | 4.1 | 3.7 |
| Performance stock units                                                                           |           |           |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                |           |           |   |   |
| Stock-based compensation expense (income)                                                         | $ (1.0)        | $ (2.5)        | $ 0.2 | $ 0.8 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
No definition available.
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| X                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
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