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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
RSUs | Ratably      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
RSUs | Cliff      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of awards granted (in dollars per share) $ 77.67 $ 39.79 $ 54.64
Total fair value of awards that vested $ 15.4 $ 8.9 $ 14.5
Total unrecognized stock compensation expense $ 13.6    
Weighted average period to recognize unrecognized compensation cost 1 year 9 months 7 days    
Performance-Based RSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target award available for grant 0.00%    
Performance-Based RSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target award available for grant 200.00%    
Performance-Based RSUs | Cliff      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Time-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value of awards granted (in dollars per share) $ 71.88 $ 40.61 $ 52.46
Total fair value of awards that vested $ 22.7 $ 11.5 $ 20.7
Total unrecognized stock compensation expense $ 24.4    
Weighted average period to recognize unrecognized compensation cost 1 year 9 months 29 days    
2016 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares authorized (in shares) 17.1    
Shares available (in shares) 5.4