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Goodwill And Intangible Assets, Net (Summary of Goodwill and Intangible Assets, Net) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 1,187,000,000.0		$ 1,187,000,000.0		$ 1,185,000,000.0
Franchise rights - indefinite-lived	509,000,000.0		509,000,000.0		509,000,000.0
Other intangibles	19,400,000		19,400,000		19,600,000
Other intangible assets, gross	528,400,000		528,400,000		528,600,000
Less: accumulated amortization	(7,400,000)		(7,400,000)		(7,100,000)
Other intangible assets, net	521,000,000.0		521,000,000.0		$ 521,500,000
Franchise rights impairment	$ 0	$ 0	0	$ 57,500,000
Franchise Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Franchise rights impairment			$ 0

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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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.

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