Debt (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 07, 2022 USD ($)
Debt Instrument [Line Items]
Bank, legal and other fees					$ 3.1
Amount capitalized and recorded as a component of long-term debt					$ 3.0
Basis point SOFR adjustment		10
Unamortized debt financing costs wrote off	$ 0.6	$ 0.0	$ 0.0	$ 0.6
Surety bonds outstanding		21.9
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit availability		175.0
Term Loan A [Member]
Debt Instrument [Line Items]
Line of credit availability		450.0
Bi-lateral Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit availability		25.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit availability		500.0
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit availability		$ 150.0
Revolving Credit Facility [Member] | Term Loan A [Member]
Debt Instrument [Line Items]
Interest rate		1.375%
Refinanced Senior Credit Facility [Member]
Debt Instrument [Line Items]
Financial covenants		The senior secured credit facility includes two financial covenants that require the ratio of consolidated earnings before interest, taxes, depreciation and amortization (“EBITDA”) to consolidated cash interest expense minus cash consolidated interest income to be greater than or equal to 3.0 to 1.0 and requires the ratio of consolidated funded indebtedness, minus AWI and domestic subsidiary unrestricted cash and cash equivalents up to $100 million, to consolidated EBITDA to be less than or equal to 3.75 to 1.0 (subject to certain exceptions for certain acquisitions).
Maximum unrestricted cash and cash equivalents for leverage ratio calculation		$ 100.0
Refinanced Senior Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of EBITDA to consolidated cash interest expense minus cash consolidated interest income		3
Refinanced Senior Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of consolidated funded indebtedness, minus unrestricted cash and cash equivalents		3.75
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility amount		$ 950.0