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Percentage range of shares received at vesting for stock units based on our total stockholder return ("TSR") relative to the performance of companies in the NASDAQ-100 Index for each measurement period.

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Stock-Based Compensation, Employee Benefit Plans, and Stock Repurchase Program - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 25, 2025 $ / shares shares	Feb. 28, 2025 USD ($)	Apr. 25, 2025 shares	Mar. 31, 2025 USD ($) plan $ / shares shares	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	May 22, 2024 USD ($)	Aug. 31, 2022 USD ($)	Nov. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans \| plan				2
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) \| shares				10.6
Share-based compensation arrangement by share-based payment award, expiration period				10 years
Deferred income tax expense (benefit)				$ (40.0)	$ 82.0	$ (213.0)
Deferred compensation plan assets				36.0	30.0
Deferred compensation liability, classified, noncurrent				36.0	31.0
Deferred compensation arrangement with individual, contributions by employer				$ 35.0	$ 39.0	$ 42.0
Measurement periods for common stock, relative TSR				3 years
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock, shares, acquired (in shares) \| shares	0.4		7.4
Shares acquired, average cost per share (in dollars per share) \| $ / shares	$ 135.05
November 2020 Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount									$ 2,600.0
Stock repurchased and retired during period (in shares) \| shares				0.0	0.0	5.1
August 2022 Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount								$ 2,600.0
Stock repurchased and retired during period (in shares) \| shares				1.2	10.0	5.3
May 2024 Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount							$ 5,000.0
Stock repurchased and retired during period (in shares) \| shares				16.4	0.0	0.0
Treasury stock, value, acquired, cost method		$ 1,000.0
Treasury stock, shares, acquired (in shares) \| shares				7.0
Stock-based compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred income tax expense (benefit)				$ 85.0	$ 79.0	$ 72.0
Vesting Year3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period				35 months
Vesting Year4 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vesting period				4 years
2019 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage allowed of exercise price of stock options compared to fair market value on date of grant				100.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value				$ 0.4	$ 10.0	$ 15.0
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| $ / shares				$ 137.53	$ 128.66	$ 127.98
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value				$ 35.0	$ 11.0	$ 9.0
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized				$ 13.0
Market Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| $ / shares				$ 80.91	$ 152.92	$ 176.70
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value				$ 3.0	$ 4.0	$ 12.0
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized				$ 13.0
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| $ / shares				$ 34.07	$ 30.82	$ 33.91
Measurement period of shares received at vesting based on total stock return measurement				6 months
Minimum percentage that employees authorized for payroll deductions				2.00%
Maximum percentage that employees authorized for payroll deductions				10.00%
Share-based compensation arrangement by share-based payment award, discount from market price, offering date				85.00%
Number of shares available for grant, employee stock purchase plans (in shares) \| shares				2.1
Stock-based compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized				$ 766.0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| $ / shares				$ 138.59	$ 129.30	$ 126.41
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value				$ 633.0	$ 519.0	$ 460.0
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized				$ 740.0
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition				1 year 8 months 12 days
Maximum \| 2019 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) \| shares				29.5
Maximum \| Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on total stock return measurement				200.00%
Maximum \| Market Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on relative total stock return measurement				200.00%
Percentage range of shares received at vesting based on absolute total stock return measurement				75.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement periods for performance based restricted stock				3 years
Minimum \| Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on total stock return measurement				0.00%
Minimum \| Market Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage range of shares received at vesting based on relative total stock return measurement				0.00%
Percentage range of shares received at vesting based on absolute total stock return measurement				0.00%