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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, 2016
Mar. 31, 2015
Affiliate Equity [Abstract]    
Net income (controlling interest) $ 104.5 $ 128.0
Increase in controlling interest paid-in capital from purchases and sales of Affiliate equity issuances (0.9) 0.5
Decrease in controlling interest paid-in capital related to Affiliate equity repurchases (17.5) (3.5)
Net income attributable to controlling interest and transfers (to) or from Non-controlling interests $ 86.1 $ 125.0