Litigation and Related Matters (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended	60 Months Ended
	Sep. 30, 2010 Site	Mar. 31, 2022 USD ($) Litigation Site	Mar. 31, 2021 USD ($)	Dec. 31, 2007	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Number of active and independent litigation matters for which pursuing coverage and recoveries | Litigation		2
Settlement agreement amount of litigation agreement					$ 53.0
Environmental insurance recoveries received in excess of cumulative expenses incurred		$ 4.0			4.8
Environmental liabilities		0.5			0.7
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)		0.6	$ 0.0
Accounts Payable and Accrued Expenses [Member]
Loss Contingencies [Line Items]
Environmental liabilities		$ 0.1			$ 0.2
Macon Site [Member]
Loss Contingencies [Line Items]
Number of landfills listed as Superfund site | Site		2
Number of landfills AWI entered into an Administrative Order on Consent for a Removal Action | Site	1
Submission date of final report to EPA	Oct. 11, 2016
Elizabeth City [Member]
Loss Contingencies [Line Items]
Percentage of site costs Navy agreed to pay				33.33%