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Affiliate Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Affiliate Equity [Abstract]          
Compensation expenses related to affiliate equity noncontrolling interests $ 37.9 $ 19.7 $ 43.3 $ 27.2  
Affiliate equity compensation cost not yet recognized 81.3   $ 81.3   $ 71.1
Period for recognition     4 years    
Affiliate equity compensation cost not yet recognized attributable to noncontrolling interest $ 56.6   $ 56.6   $ 41.6