Management Contracts (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Deferred tax liabilities	$ 13.6	$ 14.8
Management contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Value of contracts		52
Amortization expense	2.6
Management contracts, net of accumulated amortization	47
Eola [Member]
Business Acquisition [Line Items]
Recorded goodwill	26.2	26.2
Liability related to contingent consideration	0	31
Deferred tax liabilities	$ 13.6	$ 14.8