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Goodwill And Intangible Assets, Net (Summary of Goodwill and Intangible Assets, Net) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Franchise rights - indefinite-lived | $ 575.3 | $ 509.0
Other intangibles | 19.5 | 19.6
Other intangible assets, gross | 594.8 | 528.6
Less: accumulated amortization | (7.7) | (7.1)
Other intangible assets, net | 587.1 | 521.5
Goodwill | $ 1,224.0 | $ 1,185.0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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