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Share-Based Compensation - Equity Incentive Plans, Stock Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 180.4	$ 177.5	$ 170.4
Income tax benefit	37.9	37.5	36.4
Net income effect of share-based compensation	142.5	140.0	134.0
Capitalized share-based compensation expense	17.4	19.0	19.7
Share-based compensation expense previously capitalized	$ 21.8	25.6	27.2
2004 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares authorized (in shares)	72,389,717
Number of shares available for grant (in shares)	10,843,385
Amortization expense charged to cost of sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 21.8	25.6	27.2
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	104.6	94.3	83.1
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Pre-tax effect of share-based compensation	$ 54.0	$ 57.6	$ 60.1

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-Topic 718
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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