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Commitments and Contingencies - Narrative (Details)						3 Months Ended		12 Months Ended
	Apr. 14, 2021 USD ($) mi	Jun. 30, 2018 party	Oct. 31, 2016 USD ($)	Mar. 03, 2016 USD ($)	Apr. 11, 2014 USD ($) mi	Dec. 31, 2021 USD ($) site mi	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) site mi	Nov. 30, 2021 USD ($)	Oct. 18, 2021	Dec. 31, 2020 USD ($) mine	Apr. 30, 2015 USD ($)
Site Contingency
Number of sites subject to remediation | site						19		19
Number of sites subject to remediation activities, cost in excess of 100K | site						12		12
Cost per site minimis threshold								$ 100,000
Number of sites subject to remediation activities, discontinued operations | site						18		18
Number of sites subject to remediation activities, active operations | site						2		2
Number of sites, investigation completed | site						16		16
Number of sites investigation in progress | site						3		3
Environmental						$ 46,600,000		$ 46,600,000			$ 42,200,000
Environmental						11,300,000		11,300,000			$ 12,600,000
Estimated insurance recoveries						25,000,000		25,000,000
Insurance recoveries								22,000,000
Loss contingency, estimated insurance recoveries						10,000,000		10,000,000
Estimated insurance recoveries						3,000,000		$ 3,000,000
Lower Passaic River Study Area
Site Contingency
Portion of site subject to remediation | mi					8
Number of potentially responsible parties | site								70
Estimate of cost												$ 726,000,000
Estimate low end			$ 165,000,000
Development period (years)			4 years
Potentially responsible parties | party		120
Upper Nine Miles Of The River
Site Contingency
Portion of site subject to remediation | mi	9
Estimate of loss exposure in excess of accrual	$ 441,000,000
Lower Passaic River Study Area, Lower Eight Miles
Site Contingency
Environmental						6,600,000		$ 6,600,000
Change in reserve accrual								5,700,000
Arizona Uranium Mines
Site Contingency
Environmental						13,500,000		13,500,000
Investigate sites notice from EPA | mine											8
Percentage of expenses reimbursable by the U.S.										35.00%
Future contributions from U.S.						3,400,000		3,400,000
Minimum | Lower Passaic River Study Area
Site Contingency
Estimate of loss exposure in excess of accrual				$ 1,380,000,000	$ 953,000,000
Maximum | Lower Passaic River Study Area
Site Contingency
Estimate of loss exposure in excess of accrual				$ 1,730,000,000
Asbestos Issue
Site Contingency
Insurance coverage amount						3,200,000		3,200,000
Insurance coverage received payment						1,000,000	$ 1,000,000
Estimated insurance recoveries, current year									$ 2,200,000
Asbestos Issue | GST
Site Contingency
Amount recovered						$ 8,800,000		$ 8,800,000
Affiliated Entity | Crucible Steel Corporation
Site Contingency
Number of sites subject to remediation | site						19		19
Portion of site subject to remediation | mi						17		17

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