Income Taxes (Operating Loss and Tax Credit Carryforwards) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
U.S. Federal net operating loss carryforwards	$ 287.4	$ 346.0
United States [Member]
U.S. Federal net operating loss carryforwards	113.9
U.S. credit carryforwards	95.0
State and Local Jurisdiction [Member]
U.S. credit carryforwards	27.1
U.S. State net operating loss carryforwards	2,497.0
Non-U.S. [Member]
Non-U.S. net operating loss carryforwards	477.3
Non-U.S. credit carryforwards	$ 17.3

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

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local 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 foreign tax credit carryforwards.

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