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Share-Based Compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Tax deficiencies associated with equity awards	$ 1.2	$ 4.6	$ 2.6
Restricted share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Equity instruments other than options, vested in period, fair value	$ 20.2	$ 18.5	$ 15.0
Shares withheld for tax purposes upon vesting of restricted share units (in shares)	0.9	0.9	0.7
Share-based Payment Arrangement, Options and Stock Appreciation Rights (SARS)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Intrinsic value of shares exercised		$ 0.1	$ 0.1
Exercisable, aggregate intrinsic value	$ 0.1
Minimum | Restricted share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	1 year
Minimum | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	1 year
Expiration period (in years)	7 years
Maximum | Restricted share units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	3 years
Maximum | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)	3 years
Expiration period (in years)	10 years

X

- Definition

Income Tax Expense (Benefit), Excess Tax Deficiencies (Benefit) from Share-based Compensation

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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