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Equity and Capital (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 05, 2017
Schedule of Shareholders' Equity [Line Items]              
Compensation cost         $ 0.1 $ 0.1  
Available repurchase amount $ 275.0       $ 275.0    
Dividends, per common share $ 0.28   $ 0.275   $ 0.280 $ 0.275  
Accounts Payable and Accrued Liabilities              
Schedule of Shareholders' Equity [Line Items]              
Dividends payable $ 85.2   $ 85.3   $ 85.2 $ 85.3  
Common Stock              
Schedule of Shareholders' Equity [Line Items]              
Share repurchase program, number of shares authorized (in shares) 800,000   2,200,000   800,000 2,200,000  
Share repurchase program, average cost per share         $ 17.43 $ 15.36  
Share repurchase program, value         $ 14.6 $ 33.2  
Stock repurchased during period (in shares) 175,000 660,000 241,000 1,922,000      
Common Stock | RSUs              
Schedule of Shareholders' Equity [Line Items]              
Stock repurchased during period (in shares)         100,000 100,000.0  
Common Stock | Maximum              
Schedule of Shareholders' Equity [Line Items]              
Share repurchase program, authorized amount             $ 400.0