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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 67.2 $ 72.2
Deferred revenue 1.2 7.2
Stock compensation expense 4.5 11.5
Research and development credits 17.3 24.9
Lease right-of-use asset 22.4 15.2
Accrued expenses and liabilities 14.2 7.6
Other, net 4.5 6.4
Total gross deferred tax assets 131.3 145.0
Less valuation allowance (38.5) (42.0)
Total deferred tax assets 92.8 103.0
Deferred tax liabilities:    
Intangible assets 104.9 144.0
Lease liability 20.2 14.6
Property, plant and equipment 3.5 15.7
Total deferred tax liabilities 128.6 174.3
Net deferred tax liability $ (35.8) $ (71.3)