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Goodwill And Intangible Assets, Net (Details) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Goodwill and Intangible Assets [Line Items]      
Goodwill $ 1,527,900,000   $ 1,511,300,000
Franchise rights - indefinite-lived 603,700,000   589,400,000
Other intangibles 19,400,000   16,300,000
Intangible assets, gross 623,100,000   605,700,000
Less: accumulated amortization (8,000,000)   (7,500,000)
Other intangible assets, net 615,100,000   $ 598,200,000
Goodwill impairment 0    
Franchise rights impairment $ 0 $ 0  
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