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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