Change in Accounting Principle - Schedule of Consolidated Cash Flows (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025		Dec. 31, 2024		Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net (loss) income	[2]	$ 112.5	[1]	$ 65.7	[3]	$ 67.8	[3]
Deferred income taxes	[2]	33.1		12.6	[4]	13.6	[4]
LIFO valuation inventory expense				0.0		0.0
Trade and other receivables	[2]	(81.9)		(4.5)	[4]	33.1	[4]
Inventories	[2]	(125.3)		(50.4)	[4]	21.5	[4]
Accrued liabilities	[2]	13.4		9.9	[4]	6.6	[4]
Net cash provided by operating activities	[2]	111.4		167.1	[4]	211.9	[4]
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net (loss) income				46.8		47.2
Deferred income taxes				6.8		7.5
LIFO valuation inventory expense				3.5		1.0
Trade and other receivables				(4.4)
Inventories				(29.4)		47.2
Accrued liabilities				10.0
Net cash provided by operating activities				167.1		211.9
As Computed using LIFO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net (loss) income		(29.1)
Deferred income taxes		(7.0)
Trade and other receivables		(84.2)
Inventories		58.7
Net cash provided by operating activities		111.4
Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net (loss) income		141.6		18.9		20.6
Deferred income taxes		40.1		5.8		6.1
LIFO valuation inventory expense				(3.5)		(1.0)
Trade and other receivables		2.3		(0.1)
Inventories		(184.0)		(21.0)		(25.7)
Accrued liabilities				(0.1)
Net cash provided by operating activities		$ 0.0		$ 0.0		$ 0.0

[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 18 for further discussion.

[2] See Note 16 for supplemental disclosure of cash flow information.

[3] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 18 for further discussion.

[4] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 18 for further discussion.