Goodwill and Other Intangible Assets, Net - Other Intangible Assets, Net (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Gross Intangible Assets
Beginning balance	$ 775.4
Acquisitions		$ 10.5
Adjustments and Other		(9.6)
Ending balance	776.3	775.4
Accumulated Amortization
Beginning balance	(634.3)
Additions Charged to Expense	(30.4)
Adjustments and Other	3.8
Ending balance	(660.9)	(634.3)
Other Intangible Assets, Net	115.4	141.1
Other Noncurrent Assets \| Accounting Standards Update 2014-09
Accumulated Amortization
Deferred financing costs	5.7
Customer relationships, franchise and other municipal agreements
Gross Intangible Assets
Beginning balance	666.0
Acquisitions		9.8
Adjustments and Other		(0.1)
Ending balance	675.7	666.0
Accumulated Amortization
Beginning balance	(554.7)
Additions Charged to Expense	(28.2)
Adjustments and Other	0.0
Ending balance	(582.9)	(554.7)
Other Intangible Assets, Net	92.8
Non-compete agreements
Gross Intangible Assets
Beginning balance	35.6
Acquisitions		0.7
Adjustments and Other		0.0
Ending balance	36.3	35.6
Accumulated Amortization
Beginning balance	(28.5)
Additions Charged to Expense	(1.6)
Adjustments and Other	0.0
Ending balance	(30.1)	(28.5)
Other Intangible Assets, Net	6.2
Other intangible assets
Gross Intangible Assets
Beginning balance	73.8
Acquisitions		0.0
Adjustments and Other		(9.5)
Ending balance	64.3	73.8
Accumulated Amortization
Beginning balance	(51.1)
Additions Charged to Expense	(0.6)
Adjustments and Other	3.8
Ending balance	(47.9)	$ (51.1)
Other Intangible Assets, Net	$ 16.4

Finite-Lived Intangible Assets, Adjustments And Other Expenses

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Finite-lived Intangible Assets Accumulated Depreciation [Roll Forward] [Roll Forward]

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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