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Goodwill And Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 1,346.0 $ 1,314.7
Franchise rights - indefinite-lived 399.4 348.1
Other intangibles 14.1 12.6
Intangible assets, gross 413.5 360.7
Less: accumulated amortization (6.6) (6.0)
Other intangible assets, net $ 406.9 $ 354.7