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Equity and Capital (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 05, 2017
Schedule of Shareholders' Equity [Line Items]      
Compensation cost $ 0.1 $ 0.1  
Available repurchase amount $ 278.0    
Dividends, per common share $ 0.28 $ 0.275  
Accounts Payable and Accrued Liabilities      
Schedule of Shareholders' Equity [Line Items]      
Dividends payable $ 85.0 $ 85.3  
Common Stock      
Schedule of Shareholders' Equity [Line Items]      
Share repurchase program, number of shares authorized (in shares) 700,000 1,900,000  
Share repurchase program, average cost per share $ 17.53 $ 15.47  
Share repurchase program, value $ 11.6 $ 29.7  
Stock repurchased during period, shares 660,000 1,922,000  
Common Stock | RSUs      
Schedule of Shareholders' Equity [Line Items]      
Stock repurchased during period, shares 100,000.0 100,000.0  
Common Stock | Maximum      
Schedule of Shareholders' Equity [Line Items]      
Share repurchase program, authorized amount     $ 400.0