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Share-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Apr. 26, 2021
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Accelerated compensation expense $ 4.8 $ 2.6 $ 15.8 $ 2.6    
Award expense classified as a liability           $ 4.8
2021 Equity and Performance-Based Incentive Compensation Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized (in shares)         3,000,000