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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Deferred tax assets:      
Net operating loss carryforwards $ 72.2 $ 73.1 $ 85.7
Property, plant and equipment 0.0 37.2 0.0
Accrued vacation 1.6 1.5 1.2
AR allowance 1.6 1.2 3.3
Stock compensation expense 11.5 13.8 16.0
Research and development credits 24.9 27.6 25.4
Lease right-of-use asset 15.2 16.3 0.0
Uncertain state tax positions 1.1 1.6 1.3
Other, net 16.9 9.6 9.0
Total gross deferred tax assets 145.0 181.9 141.9
Less valuation allowance (42.0) (42.4) (38.9)
Total deferred tax assets 103.0 139.5 103.0
Deferred tax liabilities:      
Intangible assets 144.0 150.3 175.4
Lease liability 14.6 15.8 0.0
Property, plant and equipment 15.7 0.0 2.5
Deferred revenue 0.0 0.0 7.7
Total deferred tax liabilities 174.3 166.1 185.6
Net deferred tax liability $ (71.3) $ (26.6) $ (82.6)