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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 3.4 | $ 4.0 | $ 5.4 | $ 7.2
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | 0.8 | 0.5 | 1.3 | 1.0
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 1.9 | 2.0 | 2.9 | 2.9
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 204,981 |  |  |
Performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 0.7 | 1.5 | 1.2 | 3.3
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 529,496 |  |  |
Fully Vested On The Grant Date | Director | Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 1.0 | $ 1.0 | $ 1.0 | $ 1.0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 119,925 |  |  |

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- 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. + Details
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