Current Expected Credit Losses ("CECL") - Components of Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 72.8	$ 85.7
Gift card receivables	6.9	22.5
Notes receivable	20.1	18.6
Financing receivables	78.4
Accounts and financing receivable, before allowance for credit loss	162.7	199.5
Less: allowance for credit losses	(15.6)	(23.1)
Accounts and financing receivable, after allowance for credit loss	147.1	176.4
Less: current portion	(99.3)	(121.9)
Long-term receivables	47.8	54.5
Equipment leases receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	37.5	43.9
Direct financing leases receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	18.9	22.7
Franchise fee notes receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	0.1	0.1
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables	$ 6.4	$ 6.0