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Goodwill and Franchise Value - Franchise Value (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance		$ 306.7	$ 288.7
Adjustments to purchase price allocations			3.5
Additions through acquisitions		51.9	20.9
Reductions through divestitures		(4.0)	(6.0)
Reductions from impairments	$ (3.5)	(4.4)	(0.4)
Ending balance		$ 350.2	306.7
Franchise value acquired, including purchase accounting adjustments			$ 24.4

X

- Definition

Franchise Value, Impairment

+ References

No definition available.

+ Details

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X

- Definition

Indefinite-lived Intangible Assets, Acquired And Purchase Accounting Adjustments

+ References

No definition available.

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X

- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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X

- Definition

Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit, from purchase accounting adjustments.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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X

- Definition

Amount of divestiture of an asset lacking physical substance and having a projected indefinite period of benefit to fair value. Excludes financial assets and goodwill.

+ References

No definition available.

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- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

+ References

No definition available.

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