Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	[1]	$ 1,513.2	$ 1,515.0	$ 1,511.3
Franchise rights - indefinite-lived		580.1	572.2
Other intangible assets		22.2	23.3
Intangible assets, gross		602.3	595.5
Less: accumulated amortization		(6.9)	(8.7)
Intangible assets, net		$ 595.4	$ 586.8

[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.