Change in Accounting Principle - Schedule of Consolidated Cash Flows (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss)	[1]	$ 21.6	$ 18.2	[2]
Deferred income taxes	[1]	6.4	4.8	[2]
Inventories	[1]	29.5	12.8	[2]
Net cash provided by operating activities	[1]	57.0	63.3	[2]
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss)			24.6
Deferred income taxes			6.8
Inventories			4.4
Net cash provided by operating activities		57.0	63.3
As Computed using LIFO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss)		(3.7)
Deferred income taxes		(1.5)
Inventories		62.7
Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss)		25.3	(6.4)
Deferred income taxes		7.9	(2.0)
Inventories		$ (33.2)	$ 8.4

[1] See Note 12 for supplemental cash flow information.

[2] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.