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Income Taxes (Summary Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Deferred Tax Asset Intellectual property $ 147.0 $ 165.5
Deferred revenue, accruals and reserves 73.7 68.6
Deferred Tax Asset Research and Development Costs 12.0 0.0
Net operating loss carryforwards 3.4 4.7
Tax credit carryforwards 3.8 3.5
Other 1.8 1.7
Total deferred tax assets 241.7 244.0
Valuation allowance (5.5) (5.5)
Net deferred tax assets 236.2 238.5
Property and equipment (0.5) (6.6)
Other (1.1) (1.2)
Deferred Tax Liabilities, Gross (1.6) (7.8)
Total deferred tax assets $ 234.6 $ 230.7