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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, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 104.3 $ 75.2 $ 281.5 $ 202.3
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity (3.6) 0.9 (17.1) (23.1)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 100.7 $ 76.1 $ 264.4 $ 179.2