Landfill and Environmental Costs - Final Capping, Closure and Post-Closure Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure
Asset retirement obligation liabilities, beginning of year			$ 1,292.0	$ 1,257.7
Non-cash additions			21.6	21.8
Acquisitions, net of divestitures and other adjustments			0.2	1.9
Asset retirement obligation adjustments			(0.5)	(17.6)
Payments			(23.8)	(22.1)
Accretion expense	$ 20.5	$ 20.2	40.9	40.6
Asset retirement obligation liabilities, end of period	1,330.4	1,282.3	1,330.4	1,282.3
Less: current portion	(76.8)	(81.0)	(76.8)	(81.0)
Long-term portion	$ 1,253.6	$ 1,201.3	$ 1,253.6	$ 1,201.3

Additions due to acquisitions and other adjustments related to asset retirement obligations.

No definition available.

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- Definition

Amount of addition (reduction) of an adjustment to asset retirement obligation

+ References

No definition available.

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- Definition

Non cash asset additions related to asset retirement obligations.

+ References

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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- Definition

Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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- Definition

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

+ References

No definition available.

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- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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