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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 109.2 $ 107.7 $ 321.1 $ 362.0
Increase in controlling interest paid-in capital from purchases and sales of Affiliate equity issuances 5.3 0.0 1.9 1.0
Decrease in controlling interest paid-in capital related to Affiliate equity repurchases (2.1) (16.9) (23.4) (49.0)
Net income attributable to controlling interest and transfers (to) or from Non-controlling interests $ 112.4 $ 90.8 $ 299.6 $ 314.0