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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 128.7 $ 99.1 $ 256.7 $ 176.2
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity (28.6) 2.8 (31.6) (13.5)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 100.1 $ 101.9 $ 225.1 $ 162.7