Environmental Obligations - Environmental Reserve Rollforward (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Total environmental reserves, net of recoveries, beginning balance	$ 6.7
Change in reserves	(0.3)
Cash payments	(0.3)
Total environmental reserves, net of recoveries, ending balance	$ 6.1

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

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