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Affiliate Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Affiliate Equity (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Affiliate Equity [Abstract]
Compensation expenses related to affiliate equity attributable to noncontrolling interest	$ 5.9	$ 7.9	$ 49.0	$ 35.1
Affiliate equity compensation cost not yet recognized	78.6		$ 78.6		$ 71.1
Period for recognition (in years)			4 years
Affiliate equity compensation cost not yet recognized attributable to noncontrolling interest	$ 54.3		$ 54.3		$ 41.6