Goodwill and Other Intangible Assets, Net - Other Intangible Assets, Net (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Gross Intangible Assets
Beginning balance	$ 748.0
Acquisitions	1.7
Ending balance	749.7
Accumulated Amortization
Beginning balance	(501.6)
Additions Charged to Expense	(33.5)
Ending balance	(535.1)
Other Intangible Assets, Net	214.6	$ 246.4
Customer relationships, franchise and other municipal agreements
Gross Intangible Assets
Beginning balance	651.6
Acquisitions	1.2
Ending balance	652.8
Accumulated Amortization
Beginning balance	(431.0)
Additions Charged to Expense	(31.1)
Ending balance	(462.1)
Other Intangible Assets, Net	190.7
Non-compete agreements
Gross Intangible Assets
Beginning balance	30.8
Acquisitions	0.5
Ending balance	31.3
Accumulated Amortization
Beginning balance	(22.1)
Additions Charged to Expense	(1.7)
Ending balance	(23.8)
Other Intangible Assets, Net	7.5
Other intangible assets
Gross Intangible Assets
Beginning balance	65.6
Acquisitions	0.0
Ending balance	65.6
Accumulated Amortization
Beginning balance	(48.5)
Additions Charged to Expense	(0.7)
Ending balance	(49.2)
Other Intangible Assets, Net	$ 16.4