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Stock-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
Feb. 28, 2021
USD ($)
performance_criteria
shares
Dec. 31, 2020
USD ($)
Award_Type
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 43,200,000 $ 30,800,000 $ 33,100,000
Tax benefit for share-based compensation expense   10,000,000.0 7,000,000.0 7,600,000
Defined contribution cost recognized   $ 600,000    
Deferred Compensation, Share-based Payments        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares held in employee trust earned but not distributed (in shares) | shares   495,774    
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 400,000 1,300,000 2,800,000
Award vesting period   3 years    
Compensation cost not yet recognized   $ 700,000    
Period of recognition for unrecognized compensation costs   1 year 4 months 24 days    
Fair value of award   $ 200,000 4,100,000 200,000
Aggregate intrinsic value   $ 800,000    
Weighted-average remaining contractual term of non-vested shares   1 year 4 months 24 days    
Restricted Stock Awards | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected forfeiture rate   5.00%    
Restricted Stock Awards | Graduated or Graded Vesting | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Restricted Stock Awards | Graduated or Graded Vesting | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   4 years    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 2,100,000 2,100,000 1,900,000
Aggregate intrinsic value   11,500,000    
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 39,600,000 $ 28,800,000 $ 30,600,000
Award vesting period   3 years    
Compensation cost not yet recognized   $ 28,000,000.0    
Period of recognition for unrecognized compensation costs   2 years 2 months 12 days    
Number of performance award types | Award_Type   3    
Aggregate intrinsic value   $ 63,700,000    
Weighted-average remaining contractual term of non-vested shares   1 year 4 months 24 days    
Number of performance awards where the performance period has ended | Award_Type   2    
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected forfeiture rate   0.00%    
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected forfeiture rate   7.00%    
Internal Metrics Performance Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of performance award types | Award_Type   2    
Rights to share portion of award, maximum percent   100.00%    
Market Based Performance Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of performance award types | Award_Type   1    
Rights to share portion of award, maximum percent   100.00%    
Rights to cash portion of award, maximum percent   100.00%    
Employee Performance Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Minimum operating cash flow for performance based award   $ 100,000,000    
Employee Performance Share Awards | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of performance criteria | performance_criteria 3      
Number of performance awards issued and certified (in shares) | shares 481,784      
Grant date fair value of performance shares issued and certified $ 11,200,000      
Employee Performance Share Awards | 50% Vesting on Third Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Rights to share portion of award, maximum percent   100.00% 33.00% 33.00%
Hybrid Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum operating cash flow for performance based award   $ 100,000,000    
Hybrid Performance Shares | Graduated or Graded Vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Hybrid Performance Shares | 25% Vesting on First and Second Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   25.00%    
Hybrid Performance Shares | 50% Vesting on Third Anniversary        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage   50.00%    
TSR Performance Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period of peer group   3 years    
Cash payments for share-based compensation   $ 14,000,000.0 $ 5,000,000.0 $ 3,300,000
Number of performance awards issued and certified (in shares) | shares   482,581    
Grant date fair value of performance shares issued and certified   $ 9,600,000    
Payments for stock-based compensation   7,900,000    
TSR Performance Share Awards | Liability        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Current portion of share-based liability   0 6,100,000  
Noncurrent portion of share-based liability   $ 6,800,000 $ 4,100,000