Income Taxes - Classification of Net Deferred Income Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Long-term deferred income tax assets	$ 701.4	$ 670.2
Long-term deferred income tax liabilities	(92.0)	(84.8)
Net deferred income tax asset	$ 609.4	$ 585.4

Amount of deferred tax liability attributable to taxable temporary differences.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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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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