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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Jun. 30, 2019	Sep. 30, 2020
Loss Contingencies [Line Items]
Reserves for environmental liabilities	$ 122.0		$ 130.0
Accrued Environmental Loss Contingencies, Current	61.0		61.0
Accrued Environmental Loss Contingencies, Noncurrent	61.0		69.0
Conditional asset retirement obligations	30.0		29.0
Estimated asbestos related net liability on a discounted basis	93.0		115.0
Liability for Asbestos and Environmental Claims, Gross	474.0		483.0
Restricted Cash and Investments	381.0		368.0
Restricted Cash and Cash Equivalents	5.0		9.0
Insurance Recoveries	68.0		68.0
Insurable liabilities	362.0		363.0
Insurance Settlements Receivable	21.0		21.0
Insurance Settlements Receivable, Current	5.0		5.0
Insurance Settlements Receivable, Noncurrent	16.0		16.0
Litigation Settlement, Amount Awarded to Other Party	17.5
Asbestos Issue [Member]
Loss Contingencies [Line Items]
Restricted Cash and Cash Equivalents	5.0		9.0
Restricted Investments	308.0		291.0
Accrued Compensation and Benefits [Member]
Loss Contingencies [Line Items]
Insurable liabilities	22.0		22.0
Other Current Assets
Loss Contingencies [Line Items]
Restricted Cash and Investments	17.0		39.0
Other Noncurrent Assets
Loss Contingencies [Line Items]
Restricted Cash and Investments	364.0		329.0
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Gross	425.0		434.0
Insurable liabilities	252.0		258.0
Other Current Liabilities
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Gross	49.0		49.0
Insurable liabilities	$ 88.0		$ 83.0
Stanton Street Facility, Marinette, WI [Member]
Loss Contingencies [Line Items]
Environmental Remediation Expense		$ 140.0

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