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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 126.3 $ 108.3 $ 248.8 $ 212.3
Increase / (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity issuances 0.9 (2.5) (0.3) (3.4)
Decrease in controlling interest paid-in capital related to Affiliate equity repurchases (16.5) (3.8) (69.1) (21.3)
Net income attributable to controlling interest and transfers (to) or from Non-controlling interests $ 110.7 $ 102.0 $ 179.4 $ 187.6