Commitments and Contingencies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 CAD ($)	Oct. 11, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Other Commitments [Line Items]
Event of default, loan due In full, term	90 days
Portion that company might be obligated to repay in the event franchisees defaulted			$ 29.8
Fair value of franchisee-related borrowings			0.3	$ 0.3
Loan facility to franchisees, maximum commitment amount			55.0
Loss contingency accrual			5.7	1.4
Insurance settlements receivable			4.8
Reserve for unfunded loan commitments			0.5	0.5
Unused credit card lines
Other Commitments [Line Items]
Remaining credit available			262.3	$ 316.4
Minimum
Other Commitments [Line Items]
Range of possible loss not accrued			0.0
Loss contingency, estimate of possible loss			0.0
Maximum
Other Commitments [Line Items]
Range of possible loss not accrued			1.0
Loss contingency, estimate of possible loss			$ 1.0
Franchise Loan Facility
Other Commitments [Line Items]
Loan facility maximum Canadian sub facility commitment amount	$ 25,000,000.0
Subsequent Event
Other Commitments [Line Items]
Loan facility to franchisees, maximum commitment amount		$ 40.0