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Goodwill and Intangible Assets, Net (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 1,314.7us-gaap_Goodwill [1] $ 1,259.6us-gaap_Goodwill [1] $ 1,237.4us-gaap_Goodwill [1]
Franchise rights - indefinite-lived 348.1us-gaap_IndefiniteLivedFranchiseRights 329.3us-gaap_IndefiniteLivedFranchiseRights  
Other intangible assets 12.6us-gaap_FiniteLivedIntangibleAssetsGross 11.1us-gaap_FiniteLivedIntangibleAssetsGross  
Intangible assets, gross 360.7us-gaap_IntangibleAssetsGrossExcludingGoodwill 340.4us-gaap_IntangibleAssetsGrossExcludingGoodwill  
Less: accumulated amortization (6.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (5.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Intangible assets, net $ 354.7us-gaap_IntangibleAssetsNetExcludingGoodwill $ 335.1us-gaap_IntangibleAssetsNetExcludingGoodwill  
[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.