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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

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