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Income Taxes (Reconciliation Of Income Tax At Effective Income Tax Rate) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Income tax expense at federal statutory rate $ (184.8) $ (164.3) $ (157.6)
State taxes, net of federal benefit (29.2) (25.5) (23.2)
Differences between statutory rate and foreign effective tax rate 9.5 23.3 27.7
Intellectual property transfer deferred tax asset 0.0 165.5 0.0
Effective tax rate reconciliation, accrual for uncertain tax positions (1.5) (5.1) (204.7)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount 4.7 1.3 (8.6)
Other 1.3 (0.2) 4.5
Income tax (expense) benefit $ 206.4 $ (2.6) $ (64.7)