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Share-Based Compensation - Equity Incentive Plans, Stock Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 61.6	$ 46.3	$ 114.5	$ 90.3
Income tax benefit	12.8	9.7	23.7	18.9
Net income effect of share-based compensation	48.8	36.6	90.8	71.4
Capitalized share-based compensation expense	5.9	5.0	9.5	10.0
Share-based compensation expense previously capitalized	8.3	4.3	16.0	10.9
Amortization expense charged to cost of sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	8.3	4.3	16.0	10.9
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	33.2	26.9	62.3	50.2
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 20.1	$ 15.1	$ 36.2	$ 29.2

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- Definition

The amount of share-based compensation expense recognized during the period that was previously capitalized to inventory.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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