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Afilliate Equity - Schedule of the Effect of Changes in the Company's Ownership Interest in its Affiliates on the Controlling Interest's Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Affiliate Equity [Abstract]                      
Net income (controlling interest) $ 150.3 $ 109.0 $ 128.7 $ 128.0 $ 172.6 $ 103.2 $ 99.1 $ 77.2 $ 516.0 $ 452.1 $ 360.5
Increase in controlling interest paid-in capital related to Affiliate equity issuances                 0.7 2.5 13.1
Decrease in controlling interest paid-in capital related to Affiliate equity repurchases                 (89.8) (35.8) (87.1)
Net income attributable to controlling interest and transfers (to) or from Non-controlling interests                 $ 426.9 $ 418.8 $ 286.5