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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
fair value of intellectual property | $ 1,800.0 |  | $ 1,200.0
Liability for Uncertain Tax Positions, Noncurrent | 7.1 |  |
Deferred Tax Asset Research and Development Costs | 23.6 | $ 12.0 |
Deferred Tax Asset Intellectual property | 266.2 | 147.0 |
Deferred Tax Asset, Valuation Allowance, Change in Tax Systems | 64.7 |  |
Deferred tax asset related to Non-US intellectual property | 118.0 | $ 0.0 | $ 165.5
State [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 38.4 |  |
Foreign [Member] |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carryforward expiration | 2028 and 2033 |  |
Federal And State [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards, Date | 2024 through 2034 |  |

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