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Goodwill and Intangible Assets, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill [1] $ 1,515.0 $ 1,511.3 $ 1,394.5
Franchise rights - indefinite-lived 572.2 589.4  
Other intangible assets 23.3 16.3  
Intangible assets, gross 595.5 605.7  
Less: accumulated amortization (8.7) (7.5)  
Intangible assets, net $ 586.8 $ 598.2  
[1] Net of accumulated impairment losses of $1.47 billion 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 associated with our Domestic reporting unit, both of which were recorded during the year ended December 31, 2008.