Financing Obligations (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2008 term_extension_option	Dec. 31, 2014 real_property	Dec. 31, 2017 monthly_payment	Dec. 31, 2015 monthly_payment	May 19, 2008 real_property
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
2015		$ 5.4
2016		5.0
2017		4.6
2018		5.2
2019		5.5
Thereafter		75.8
Total minimum lease payments		101.5
Less: interest		(58.8)
Total financing obligations		42.7
Less: current portion(2)		(0.1)
Long-term financing obligations		42.6
Sale Leaseback Transaction Agreement for Properties
Sale Leaseback Transaction [Line Items]
Parcels of real property under sale leaseback transaction					181
Master Lease Agreement
Sale Leaseback Transaction [Line Items]
Parcels of real property under sale leaseback transaction		181
Gross proceeds of sale leaseback transaction	337.2
Sale leaseback initial term	20 years
Number of options to extend initial leaseback term	4
Extension period for options to extend sale leaseback initial term (in years)	5 years
Properties assigned to franchisee or released from lessor		152
Reduction in property and equipment and financing obligations as a result of sales transactions		$ 270.6
Forecast
Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
Number of Monthly Obligation Payments in Fiscal Year			11	13