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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Deferred Tax Asset Intellectual property | $ 227.4 | $ 266.2
Deferred revenue, accruals and reserves | 72.4 | 72.9
Deferred Tax Asset Research and Development Costs | 32.5 | 23.6
Tax credit carryforwards | 6.1 | 4.6
Net operating loss carryforwards | 1.7 | 2.2
Other | 3.9 | 6.0
Total deferred tax assets | 344.0 | 375.5
Valuation allowance | (61.8) | (73.6)
Net deferred tax assets | 282.2 | 301.9
Deferred Tax Liabilities, Gross | (0.9) | (0.9)
Total deferred tax assets | $ 281.3 | $ 301.0

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