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Equity and Capital (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 31, 2020
Jan. 09, 2020
Schedule of Shareholders' Equity [Line Items]          
Compensation cost $ 100,000 $ 100,000 $ 100,000    
Remaining authorized repurchase amount $ 375,000,000.0        
Dividends, per common share $ 0.500 $ 1.125 $ 1.105    
Accounts Payable and Accrued Liabilities          
Schedule of Shareholders' Equity [Line Items]          
Dividends payable $ 66,000,000.0 $ 87,200,000      
Common Stock          
Schedule of Shareholders' Equity [Line Items]          
At-the-market equity offering program       $ 400,000,000.0  
At-the-market equity offering program, period 3 years        
At-the-market equity offering program, shares issued (in shares) 0        
At-the-market equity offering program, stock available for future issuance $ 400,000,000.0        
Share repurchase program, number of shares authorized (in shares) 1,700,000 800,000 6,300,000    
Share repurchase program, average cost per share $ 15.14 $ 17.43 $ 16.56    
Share repurchase program, value $ 25,000,000.0 $ 14,600,000 $ 104,600,000    
Stock repurchased during period (in shares) 1,650,000 835,000 6,315,000    
Common Stock | RSUs          
Schedule of Shareholders' Equity [Line Items]          
Stock repurchased during period (in shares) 200,000 100,000      
Common Stock | Maximum          
Schedule of Shareholders' Equity [Line Items]          
Share repurchase program, authorized amount         $ 400,000,000.0