Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets attributable to:
Accrued liabilities	$ 62.3	$ 31.4
Net operating loss carry forwards	17.6	23.2
Pension and postretirement benefits costs	0.0	2.9
Interest	17.0	16.2
Research and development capitalization	12.6	11.0
Valuation allowance	(15.1)	(20.6)
Other	10.8	13.3
Total deferred tax assets	105.2	77.4
Deferred tax liabilities attributable to:
Plant and equipment, principally due to differences in depreciation	124.8	138.0
Intangible assets	45.9	49.5
Pension and postretirement benefits costs	1.6	0.0
Other	8.4	5.6
Total deferred tax liabilities	180.7	193.1
Net deferred tax liability, long-term	(75.5)	(115.7)
Net deferred tax asset, long-term	15.2	14.8
Net deferred tax liability, long-term	$ 90.7	$ 130.5