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Affiliate Equity - Schedule of Changes in the Company's Interest in its Affiliates on the Controlling Interest's Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Affiliate Equity [Abstract]    
Net income (controlling interest) $ 122.5 $ 104.0
Decrease in controlling interest paid-in capital from purchases and sales of Affiliate equity issuances (1.2) (0.9)
Decrease in controlling interest paid-in capital related to Affiliate equity repurchases (52.6) (17.5)
Net income attributable to controlling interest and transfers (to) or from Non-controlling interests $ 68.7 $ 85.6