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Goodwill And Intangible Assets, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets [Line Items]    
Goodwill $ 1,515.6 $ 1,511.3
Franchise rights - indefinite-lived 589.4 589.4
Other intangibles 18.9 16.3
Intangible assets, gross 608.3 605.7
Less: accumulated amortization (7.7) (7.5)
Other intangible assets, net $ 600.6 $ 598.2
Franchise Rights [Member]    
Goodwill and Intangible Assets [Line Items]    
Date of annual goodwill and indefinite lived intangible assets impairment test April 30  
Goodwill [Member]    
Goodwill and Intangible Assets [Line Items]    
Date of annual goodwill and indefinite lived intangible assets impairment test April 30