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Stock Incentive Compensation and Employee Benefit Plans (Narrative) (Details)
12 Months Ended 24 Months Ended
Dec. 31, 2017
USD ($)
Days
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
May 16, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total fair value of shares and share units vested $ 56,900,000 $ 54,500,000 $ 34,000,000    
Cash received from exercises of stock options during the period 0 0 100,000    
Excess windfall tax benefit realized by the Company due to its net operating loss position in the taxable jurisdictions in which it operates 0        
Total stock compensation expense recognized 37,200,000 47,400,000 38,300,000    
Contributions to defined contribution pension plans $ 4,400,000 $ 4,000,000 $ 4,300,000    
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 1,762,125        
2001 Stock Incentive Plan and 2010 Performance Share Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares) | shares 0        
Employee Stock Option | 2001 Stock Incentive Plan          
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        
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected forfeiture rate   0.00%      
Unrecognized compensation costs related to restricted stock awards $ 29,100,000        
Periods for recognition of compensation costs not yet recognized 1 year 8 months 12 days        
Restricted Stock | 2001 Stock Incentive Plan and 2016 Long-Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive compensation, vesting period 4 years        
Restricted Stock | Non-Employee Director Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive compensation, vesting period 3 years        
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive compensation, vesting period 3 years     4 years  
Vesting maximum as a percentage of target if performance goal are achieved 250.00%        
Period for average closing share price to determine total shareholder return | Days 20        
Expected forfeiture rate   0.00%      
Unrecognized compensation costs related to restricted stock awards $ 4,100,000        
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        
Expected forfeiture rate   13.00%      
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs related to restricted stock awards $ 21,900,000        
Periods for recognition of compensation costs not yet recognized 1 year 7 months 6 days