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Shareholders' Equity (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 12, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 30, 2018
Oct. 29, 2018
Nov. 29, 2017
Distribution Made to Limited Partner [Line Items]              
Repurchase aggregate cost   $ 27,900,000 $ 93,000,000.0 $ 533,900,000      
Repurchase of common stock included in accrued expenses     $ 500,000        
Common stock, shares authorized (in shares)   150,000,000.0 150,000,000.0   150,000,000 50,000,000  
Tender Offer              
Distribution Made to Limited Partner [Line Items]              
Authorized stock repurchase amount             $ 500,000,000.0
Stock repurchased during period (in shares) 5,660,376            
Repurchase price (in dollars per share) $ 88.33            
Repurchase aggregate cost $ 500,000,000.0            
October 2018 Stock Repurchase Program              
Distribution Made to Limited Partner [Line Items]              
Authorized stock repurchase amount         $ 300,000,000.0    
Stock repurchased during period (in shares)   235,590 864,233 372,282      
Repurchase aggregate cost   $ 27,900,000 $ 93,000,000.0 $ 32,000,000.0      
Remaining unused authorization for stock repurchase program   $ 147,100,000