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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Deferred tax assets:    
Accrued expenses $ 64.7 $ 81.6
Capital loss carryforward 11.0 9.8
Deferred revenue 0.0 90.4
Income tax credits 312.7 306.6
Intangible assets 1,328.7 1,479.9
Inventory valuation 40.0 26.8
Lease liabilities 35.8 36.1
Net operating loss carryforward 73.9 77.0
Property, plant and equipment 7.0 40.8
Share-based compensation 37.7 45.8
Other 4.0 5.5
Gross deferred tax assets 1,915.5 2,200.3
Valuation allowances (299.4) (290.3)
Deferred tax assets, net of valuation allowances 1,616.1 1,910.0
Deferred tax liabilities:    
Convertible debt 0.0 (22.7)
Intangible assets (1.6) (92.4)
ROU assets (33.9) (33.6)
Other 0.0 (4.0)
Deferred tax liabilities (35.5) (152.7)
Net deferred tax asset 1,580.6 1,757.3
Reported as:    
Non-current deferred tax assets 1,623.3 1,797.1
Non-current deferred tax liability (42.7) (39.8)
Net deferred tax asset $ 1,580.6 $ 1,757.3