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Stock Incentive Compensation and Employee Benefit Plans (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
d
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 16, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of shares and share units vested $ 54,700,000 $ 41,600,000 $ 37,200,000  
Cash received from exercises of stock options during the period 0 0 0  
Excess windfall tax benefit realized by the Company due to its net operating loss position in the taxable jurisdictions in which it operates 300,000 200,000 0  
Total stock compensation expense recognized 43,700,000 41,400,000 35,700,000  
Contributions to defined contribution pension plans 6,700,000 $ 4,900,000 $ 4,100,000  
Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs related to restricted stock awards $ 62,500,000      
Periods for recognition of compensation costs not yet recognized 1 year 8 months 12 days      
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive compensation, vesting period 3 years      
Period for average closing share price to determine total shareholder return | d 20      
Performance period 1 year      
Unrecognized compensation costs related to restricted stock awards $ 6,100,000      
Periods for recognition of compensation costs not yet recognized 1 year 8 months 12 days      
Cash Settled Restricted Stock Unit (CSRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive compensation, vesting period 4 years      
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs related to restricted stock awards $ 500,000      
Periods for recognition of compensation costs not yet recognized 2 months 12 days      
2016 Long-Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for issuance (in shares) | shares       1,625,000
Number of shares available for grant (in shares) | shares 1,000,000.0      
2016 Long-Term Incentive Plan | Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive compensation, vesting period 4 years      
Granted March 2018 | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting maximum as a percentage of target if performance goal are achieved 250.00%      
Granted May 2018 | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting maximum as a percentage of target if performance goal are achieved 200.00%      
2001 Stock Incentive Plan | Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive compensation, vesting period 4 years      
Share-based payment award, expiration period 10 years      
Non-Employee Director Stock Incentive Plan | Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive compensation, vesting period 3 years