Landfill and Environmental Costs (Accrued Landfill and Environmental Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Environmental Remediation Obligations [Abstract]
Landfill final capping, closure and post-closure liabilities	$ 1,346.4	$ 1,335.6	$ 1,292.0	$ 1,257.7
Environmental remediation	462.8	500.2	$ 540.2	$ 564.0
Total accrued landfill and environmental costs	1,809.2	1,835.8
Less: current portion	(114.5)	(132.6)
Long-term portion	$ 1,694.7	$ 1,703.2

Landfill and environmental liabilities.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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The amount of estimated costs accrued as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility (such as a landfill or waste treatment facility). Represents the portion that will be paid within one year or the normal operating cycle, if longer.

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The estimated amount of costs required as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility, which will be paid after one year or beyond the normal operating cycle, if longer.

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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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