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Affiliate Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Affiliate Equity [Abstract]
Compensation expenses related to affiliate equity noncontrolling interests	$ 5.3	$ 7.2
Affiliate equity compensation cost not yet recognized	77.9		71.1
Period for recognition	4 years
Affiliate equity compensation cost not yet recognized attributable to noncontrolling interest	$ 50.5		$ 41.6