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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 109.0 $ 103.2 $ 365.7 $ 279.5
Decrease in controlling interest paid-in capital from purchases and sales of Affiliate equity (17.4) (3.6) (49.0) (17.1)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 91.6 $ 99.6 $ 316.7 $ 262.4