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Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	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)

X

- Definition

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

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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