Income Taxes - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Net operating loss carryforwards	$ 89.8	$ 89.7
Tax credit carryforwards	9.4	9.2
Stock-based compensation	9.4	9.6
Other comprehensive income	0.0	21.4
Inventory reserves	9.2	10.5
Right of use liability	6.9	11.7
Capitalized research and development expenditures	24.8	10.4
Reserves and other	12.0	7.5
Subtotal	161.5	170.0
Valuation allowance	(7.5)	(8.3)
Total assets	154.0	161.7
Liabilities
Accelerated depreciation	(177.2)	(179.3)
Accelerated amortization	(19.3)	(18.3)
Right of use asset	(6.9)	(11.7)
Post-retirement obligations	(0.0)	(12.7)
Other	(9.9)	(8.2)
Total liabilities	(213.3)	(230.2)
Net deferred tax liabilities	$ (59.3)	$ (68.5)

Deferred tax assets, inventory reserves.

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Deferred tax assets operating lease right of use asset.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from unrealized gains on items in other comprehensive income which can only be deducted for tax purposes when the gains are realized and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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Deferred tax liabilities operating lease liability.

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Post retirement obligations.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences from research and development costs.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets including goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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