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Stock-based Compensation Plans (Details)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
performance_condition
shares
Sep. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation | $ $ 6.9 $ 5.5 $ 17.3 $ 17.6
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period vested     3 years  
Number of performance conditions | performance_condition     2  
Number of Units Awarded (in shares)     37  
Share-based Compensation Award, Tranche One | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Units Awarded (in shares)     44  
Award vesting period     3 years  
Share-based Compensation Award, Tranche Two | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Units Awarded (in shares)     37  
Award vesting period     3 years  
Share-based Payment Arrangement, Tranche Three | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Units Awarded (in shares)     12  
Award vesting period     1 year