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Shareholders' Equity - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 10, 2020
Oct. 23, 2019
Sep. 24, 2019
Mar. 13, 2019
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Class of Stock [Line Items]              
Repurchase of sharse           $ 26,881,000 $ 5,342,000
Common stock, dividend declared (in dollars per share)     $ 3.50        
Common stock, cash dividends paid   $ 427,700,000     $ 2,900,000    
Common stock, dividend paid (in dollars per share)         $ 3.50    
Common Shares              
Class of Stock [Line Items]              
Shares paid for tax withholding for share based compensation (in shares)           183,466 163,913
Share Repurchase Program, March 13, 2019              
Class of Stock [Line Items]              
Stock repurchase program, period in force       12 months      
Repurchase of sharse           $ 20,800,000  
Share Repurchase Program, March 13, 2019 | Common Shares              
Class of Stock [Line Items]              
Stock repurchase program, authorized amount (up to)       $ 150,000,000.0      
Stock repurchase program, amount expired           $ 129,200,000  
Repurchase of shares (in shares)           711,000  
Average cost per share (in dollars per share)           $ 29.31  
Share Repurchase Program, March 10, 2020              
Class of Stock [Line Items]              
Stock repurchase program, period in force 12 months            
Share Repurchase Program, March 10, 2020 | Common Shares              
Class of Stock [Line Items]              
Stock repurchase program, authorized amount (up to) $ 150,000,000.0            
Stock repurchase program, remaining authorized repurchase amount           $ 150,000,000.0