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Stock-Based Compensation (Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 35.0 | $ 30.2 | $ 31.1
Tax benefit related to stock-based compensation expense | 2.4 | 2.6 | 2.5
Unrecognized compensation cost related to non-vested stock-based compensation arrangements | $ 30.7 |  |
Unrecognized compensation cost expected to be recognized over weighted average period (in years) | 1 year 7 months 9 days |  |
Tax benefits related to stock options exercised and vesting of restricted stock and RSUs | $ 17.2 | 4.3 | 3.3
Restricted Stock Units (RSUs) [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 35.0 | 30.0 | 29.4
Stock Options [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 0.0 | 0.1 | 0.9
Restricted Stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 0.0 | $ 0.1 | $ 0.8

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