Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Joint Ventures	Sep. 30, 2014 Financial Guarantee Joint Venture Two	Dec. 31, 2013 Financial Guarantee Joint Venture Two	Sep. 30, 2014 Performance Guarantee	Sep. 30, 2014 Pending Litigation
Loss Contingencies [Line Items]
Letters of credit outstanding		$ 9.3	$ 8.3
Litigation Settlement, Amount	2.0
Maximum range of possible loss contingency								10.0
Accrued loss contingency		1.9
Equity method investments ownership percentage				50.00%	50.00%
Maximum guarantee					8.0		5.0
Mortgage loan					38.5
Total borrowings on the loan					27.8	28.3
Unrecorded guarantee obligation					1.5	1.5
Guarantee obligation		$ 0.8	$ 0.8				$ 0.8
Franchise agreement, period							20 years
Shareholder agreements, portion of directors entitled to elect, percent				0.5
Partnership agreements, voting managing interest, percent				50.00%