Subsequent Events (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) store	Dec. 31, 2018 USD ($) Business
Subsequent Event [Line Items]
Number of franchises disposed		1	2
Cash generated from disposition	$ 9.6	$ 250.7	$ 128.7

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration