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Environmental Obligations - Environmental Reserve Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves, net of recoveries beginning of period	$ 585.8	$ 521.5	$ 411.8
Provision	53.2	138.8	178.2
Spending, net of recoveries	(81.1)	(73.8)	(65.7)
Foreign currency translation adjustments	6.5	(0.7)	(2.8)
Net Change	(21.4)	64.3	109.7
Total environmental reserves, net of recoveries end of period	$ 564.4	$ 585.8	$ 521.5

X

- Definition

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

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Amount of foreign currency translation gain (loss) which decreases (increases) the accrual for environmental loss contingencies.

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Amount of cash outflow to settle environmental loss contingencies.

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Increase (decrease) in the accrual for environmental loss contingencies during the reporting period.

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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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