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Equity - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 18, 2018
Sep. 30, 2018
Sep. 30, 2017
Dividends Payable [Line Items]      
Dividend paid [1]   $ 66.9 $ 66.6
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 $ 22.3    
[1] See Note 14 regarding quarterly cash dividend.