Capital Stock (Narrative - Share Based Compensation) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax deficiencies (benefit) on equity-based compensation awards	$ 12.0	$ 11.3	$ (14.9)
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, total intrinsic value	$ 0.2	$ 1.2	$ 2.3
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	1 year
Expiration term	7 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	5 years
Expiration term	10 years
Shares cancelled to fund withholding tax obligations on option exercises (in shares)	0.1	0.1	0.1
Restricted Share Units (RSUs) and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock and restricted share units vested	$ 89.6	$ 54.9	$ 67.8
Shares withheld for tax purposes upon vesting of restricted share units (in shares)	3.9	2.2	2.3
Restricted Share Units (RSUs) and Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	1 year
Restricted Share Units (RSUs) and Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	3 years
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other share-based compensation granted in period, fair value	$ 2.3	$ 2.3	$ 2.3
Shares issued, net of shares for tax withholdings (in shares)	0.2	0.3	0.1

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

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