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Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Income tax expense at federal statutory rate | $ (205.1) | $ (184.8) | $ (164.3)
Deferred tax asset related to Non-US intellectual property | (118.0) | 0.0 | (165.5)
Change in valuation allowance | 66.1 | 0.1 | 0.1
State taxes, net of federal benefit | (28.5) | (29.2) | (25.5)
Differences between statutory rate and foreign effective tax rate | 15.5 | 9.5 | 23.3
Effective tax rate reconciliation, accrual for uncertain tax positions | (8.3) | (1.5) | (5.1)
Other | (1.0) | (3.3) | (1.4)
Income tax (expense) benefit | $ 158.9 | $ 206.4 | $ (2.6)

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