Change in Accounting Principle - Schedule of Consolidated Income (Loss) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of products sold, excluding depreciation and amortization		$ 673.4	$ 651.3	[1]
Operating income		41.4	24.3	[1]
Income tax benefit (provision)		(7.2)	(5.5)	[1]
Net Income (Loss)	[2]	$ 21.6	$ 18.2	[1]
Earnings Per Share, Basic [Abstract]
Basic		$ 1.34	$ 1.13	[1],[3]
Diluted		$ 1.31	$ 1.12	[1],[3]
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of products sold, excluding depreciation and amortization			$ 642.9
Operating income			32.7
Income tax benefit (provision)			(7.5)
Net Income (Loss)			$ 24.6
Earnings Per Share, Basic [Abstract]
Basic			$ 1.53
Diluted			$ 1.51
As Computed using LIFO
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of products sold, excluding depreciation and amortization		$ 706.6
Operating income		8.2
Income tax benefit (provision)		0.7
Net Income (Loss)		$ (3.7)
Earnings Per Share, Basic [Abstract]
Basic		$ (0.23)
Diluted		$ (0.23)
Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of products sold, excluding depreciation and amortization		$ (33.2)	$ 8.4
Operating income		33.2	(8.4)
Income tax benefit (provision)		(7.9)	2.0
Net Income (Loss)		$ 25.3	$ (6.4)
Earnings Per Share, Basic [Abstract]
Basic		$ 1.57	$ (0.4)
Diluted		$ 1.54	$ (0.39)

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

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

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