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Income Taxes (Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Gross unrecognized tax benefits at January 1 | $ 15.1 | $ 16.0
Increases in tax positions for prior years | 0.1 | 0.1
Increases in tax positions for current year | 5.0 | 1.4
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | (10.6) | (2.4)
Gross unrecognized tax benefits at December 31 | $ 9.6 | $ 15.1

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