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Revenue Disclosures - Narrative (Details) - Receivables from Franchise Revenue Transactions - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed and unbilled receivables $ 79.5 $ 76.3
Billed and unbilled receivables, accumulated allowance for credit loss $ 7.7 $ 11.4