Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 CAD ($)	Mar. 31, 2019 USD ($)	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		$ 36.8
Fair value of franchisee-related borrowings		0.1	$ 0.3
Loan facility to franchisees, maximum commitment amount		55.0
Loss contingency accrual		1.7	1.4
Reserve for unfunded loan commitments		0.6	0.5
Unused credit card lines
Other Commitments [Line Items]
Remaining credit available		316.0	$ 316.4
Minimum
Other Commitments [Line Items]
Range of possible loss not accrued		0.0
Loss contingency, estimate of possible loss		2.6
Maximum
Other Commitments [Line Items]
Range of possible loss not accrued		1.0
Loss contingency, estimate of possible loss		$ 5.2
Franchise Loan Facility
Other Commitments [Line Items]
Loan facility maximum Canadian sub facility commitment amount	$ 25,000,000