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Goodwill And Intangible Assets (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 1,341,000,000   $ 1,314,700,000
Franchise rights - indefinite-lived 385,700,000   348,100,000
Other intangibles 13,100,000   12,600,000
Intangible assets, gross 398,800,000   360,700,000
Less: accumulated amortization (6,400,000)   (6,000,000)
Other intangible assets, net $ 392,400,000   $ 354,700,000
Franchise Rights [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Date of annual goodwill and indefinite lived intangible assets impairment test April 30 April 30  
Goodwill [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Date of annual goodwill and indefinite lived intangible assets impairment test April 30 April 30  
Fair Value, Measurements, Nonrecurring [Member] | Franchise Rights [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Franchise rights impairment $ 0 $ 0