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Goodwill And Intangible Assets, Net (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Goodwill and Intangible Assets [Line Items]      
Goodwill $ 1,427.3   $ 1,394.5
Franchise rights - indefinite-lived 536.4   432.4
Other intangibles 15.4   14.3
Intangible assets, gross 551.8   446.7
Less: accumulated amortization (7.2)   (6.8)
Other intangible assets, net $ 544.6   $ 439.9
Goodwill [Member]      
Goodwill and Intangible Assets [Line Items]      
Date of Annual Goodwill and Indefinite Lived Intangible Assets Impairment Test April 30 April 30  
Franchise Rights [Member]      
Goodwill and Intangible Assets [Line Items]      
Date of Annual Goodwill and Indefinite Lived Intangible Assets Impairment Test April 30 April 30