STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total		Common Stock	Additional Paid In Capital	Retained Earnings		Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2022		$ 631.2	[1]	$ 0.2	$ 1,090.4	$ 13.3	[1]	$ (475.9)	$ 3.2
Beginning balance (Cumulative Effect of Change in Inventory Valuation Methodology, Net of Tax) at Dec. 31, 2022	[1]	35.6				35.6
Beginning balance (shares) at Dec. 31, 2022				15,940,756
Net (loss) income		67.8	[2],[3]			67.8	[1]
Other comprehensive income, net of tax		9.9	[4]						9.9
Common shares issued (including impacts from Long-Term Incentive programs)		0.7	[1]		0.7
Common shares issued (including impacts from Long-Term Incentive programs) (shares)				98,292
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued		(1.8)	[1]		(1.8)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares)				(23,257)
Cash dividends declared	[1],[5]	(50.4)				(50.4)
Amortization of unearned equity compensation		15.4	[1]		15.4
Ending balance at Dec. 31, 2023		708.4	[1]	$ 0.2	1,104.7	66.3	[1]	(475.9)	13.1
Ending balance (shares) at Dec. 31, 2023				16,015,791
Net (loss) income		65.7	[2],[3]			65.7	[1]
Other comprehensive income, net of tax		7.4	[4]						7.4
Common shares issued (including impacts from Long-Term Incentive programs)		0.6	[1]		0.6
Common shares issued (including impacts from Long-Term Incentive programs) (shares)				107,017
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued		(2.1)	[1]		(2.1)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares)				(26,910)
Cash dividends declared	[1],[5]	(50.7)				(50.7)
Amortization of unearned equity compensation		13.8	[1]		13.8
Ending balance at Dec. 31, 2024		$ 743.1	[6]	$ 0.2	1,117.0	81.3	[1]	(475.9)	20.5
Ending balance (shares) at Dec. 31, 2024		16,095,898		16,095,898
Net (loss) income	[1]	$ 112.5	[3]			112.5
Other comprehensive income, net of tax		6.3	[1]						6.3
Common shares issued (including impacts from Long-Term Incentive programs)		0.5	[1]		0.5
Common shares issued (including impacts from Long-Term Incentive programs) (shares)				156,347
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued		(3.0)	[1]		(3.0)
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares/common shares issued (shares)				(41,802)
Cash dividends declared	[1],[5]	(51.3)				(51.3)
Amortization of unearned equity compensation		18.0	[1]		18.0
Ending balance at Dec. 31, 2025		$ 826.1	[1]	$ 0.2	$ 1,132.5	$ 142.5	[1]	$ (475.9)	$ 26.8
Ending balance (shares) at Dec. 31, 2025		16,210,443		16,210,443

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

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

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

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

[5] Dividends declared per common share were $3.08 for each of the years ended December 31, 2025, 2024, and 2023.

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