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Equity - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 20, 2017
Mar. 31, 2017
Mar. 31, 2016
Subsequent Event [Line Items]      
Dividend paid [1]   $ 22.1 $ 22.1
Stock repurchase program, remaining authorized repurchase amount   $ 238.8  
Subsequent Event      
Subsequent Event [Line Items]      
Dividend paid $ 22.2    
Dividends payable, date to be paid Apr. 20, 2017    
[1] See Note 13 regarding quarterly cash dividend.