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Share-Based Payments - Textual (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 27, 2020
Jul. 31, 2019
Feb. 28, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average fair value per share (in dollars per share)       $ 15.48 $ 15.45 $ 14.57  
Unrecognized compensation cost       $ 2,100,000      
Intrinsic value of stock options exercised       $ 2,300,000 $ 3,600,000 $ 5,200,000  
2016 Omnibus Performance Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares authorized for grant under the Plan (in shares)       14,000,000      
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiration period       10 years      
Vesting period       3 years      
Share-based compensation expense       $ 1,500,000 1,400,000 1,100,000  
Weighted-average recognition period for unrecognized compensation cost       22 months      
Employment Based SARS              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted during the period (in shares)             122,976
Stock Appreciation Rights (SARs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense       $ 100,000 $ 81,900,000 56,200,000  
Weighted-average fair value per share of awards granted (in dollars per share)         $ 870.28    
Share-based compensation arrangement by share-based payment award, equity instruments other than options, share-based liabilities paid   $ 55,000,000 $ 13,000,000        
Number of remaining shares (in shares)         115,545    
Fair value of SARs         $ 101,000,000    
Settled the acquisition shares upon payment $ 101,000,000            
Performance and Employment Based SARS              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted during the period (in shares)             129,124
Value threshold for determining fair value of common stock       400,000,000      
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense       $ 25,800,000 $ 29,500,000 $ 27,100,000  
Weighted-average recognition period for unrecognized compensation cost       20 months      
Weighted-average fair value per share of awards granted (in dollars per share)       $ 61.81 $ 49.84 $ 37.61  
Unrecognized compensation cost related to unvested SARs       $ 35,200,000      
Fair value of vested shares       $ 44,200,000 $ 45,200,000 $ 22,100,000  
Awards issued during period (in shares)       555,000      
Non-employee Directors | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average fair value per share of awards granted (in dollars per share)       $ 65.39 $ 64.48 $ 62.88  
Number of remaining shares (in shares)       577,841      
Awards issued during period (in shares)       32,196 23,270 24,771  
Compensation expense recognized       $ 2,100,000 $ 1,500,000 $ 1,600,000  
Unrecognized compensation cost       $ 0      
Non-employee Directors | Dividend Equivalent, RSU              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards issued during period (in shares)       8,987 8,876 8,045