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Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense at federal statutory rate	$ (214.6)	$ (205.1)	$ (184.8)
State taxes, net of federal benefit	(20.4)	(28.5)	(29.2)
Change in valuation allowance	(6.5)	66.1	0.1
Effective tax rate reconciliation, accrual for uncertain tax positions	2.4	(8.3)	(1.5)
Differences between statutory rate and foreign effective tax rate	(2.3)	15.5	9.5
Deferred tax asset related to Non-US intellectual property	0.0	(118.0)	0.0
Other	(3.0)	(1.0)	(3.3)
Income tax (expense) benefit	$ 236.2	$ 158.9	$ 206.4

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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