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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Affiliate Equity [Abstract]        
Net income (controlling interest) $ 100.1 $ 64.7 $ 177.2 $ 127.1
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity 2.8 (19.3) (13.5) (24.1)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 102.9 $ 45.4 $ 163.7 $ 103.0