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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 125.4 $ 110.2 $ 374.2 $ 322.5
Increase / (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity issuances (0.3) 5.3 (0.6) 1.9
Decrease in controlling interest paid-in capital related to Affiliate equity repurchases (12.7) (2.1) (81.8) (23.4)
Net income attributable to controlling interest and transfers (to) or from Non-controlling interests $ 112.4 $ 113.4 $ 291.8 $ 301.0