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Goodwill And Intangible Assets, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 1,516.1 $ 1,515.0
Franchise rights - indefinite-lived 580.1 572.2
Other intangibles 25.5 23.3
Other intangible assets, gross 605.6 595.5
Less: accumulated amortization (9.9) (8.7)
Other intangible assets, net $ 595.7 $ 586.8