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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Deferred tax assets:    
Accrued expenses $ 51.8 $ 50.2
Capital loss carryforward 9.8 10.5
Disallowed expense carryforwards 242.8 97.8
Income tax credits 266.8 267.8
Intangible assets 1,192.1 1,277.0
Inventory valuation 130.4 72.0
Lease liabilities 33.2 36.2
Net operating loss carryforward 59.3 64.8
Share-based compensation 53.5 40.6
Other 25.6 15.5
Gross deferred tax assets 2,065.3 1,932.4
Valuation allowances (287.4) (270.8)
Deferred tax assets, net of valuation allowances 1,777.9 1,661.6
Deferred tax liabilities:    
Intangible assets (50.3) (59.0)
ROU assets (31.7) (34.5)
Property, plant and equipment (1.6) (0.4)
Deferred tax liabilities (83.6) (93.9)
Net deferred tax asset 1,694.3 1,567.7
Reported as:    
Non-current deferred tax assets 1,728.1 1,596.5
Non-current deferred tax liability (33.8) (28.8)
Net deferred tax asset $ 1,694.3 $ 1,567.7