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Equity - Additional Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jul. 20, 2017
Jun. 30, 2017
Jun. 30, 2016
Dividends Payable [Line Items]      
Dividend paid [1]   $ 44.3 $ 44.3
Shares repurchased under repurchase program (in shares)   0  
Stock repurchase program, remaining authorized repurchase amount   $ 238.8  
Subsequent Event      
Dividends Payable [Line Items]      
Dividend paid $ 22.2    
Dividends payable, date to be paid Jul. 20, 2017    
[1] See Note 13 regarding quarterly cash dividend.