Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Accrued employee benefits and compensation	$ 8.7	$ 7.7
Net operating loss carryforwards	16.4	11.8
Tax credit carryforwards	7.0	6.7
Reserves and accruals	8.4	5.7
Operating leases	2.2	3.6
Capitalized research and development	30.4	25.6
Other	14.6	6.9
Total deferred tax assets	87.7	68.0
Less deferred tax asset valuation allowance	(12.5)	(11.4)	$ (2.8)	$ (9.8)
Total deferred tax assets, net of valuation allowance	75.2	56.6
Deferred tax liabilities
Depreciation and amortization	24.8	17.7
Postretirement benefit obligations	1.0	0.7
Unremitted earnings	1.3	1.5
Operating leases	2.6	4.1
Other	2.0	5.8
Total deferred tax liabilities	31.7	29.8
Net deferred tax asset (liability)	$ 43.5	$ 26.8