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Goodwill and Intangible Assets, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill [1] $ 1,394.5 $ 1,314.7 $ 1,259.6
Franchise rights - indefinite-lived 432.4 348.1  
Other intangible assets 14.3 12.6  
Intangible assets, gross 446.7 360.7  
Less: accumulated amortization (6.8) (6.0)  
Intangible assets, net $ 439.9 $ 354.7  
[1] Net of accumulated impairment losses of $1.47 billion ($1.25 billion after-tax) associated with our single reporting unit (prior to September 30, 2008, our reporting unit structure was comprised of a single reporting unit) and $140.0 million ($119.0 million after-tax) associated with our Domestic reporting unit, both of which were recorded during the year ended December 31, 2008.