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Capital Stock (Narrative - Share Based Compensation) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Excess tax deficiencies on equity-based compensation awards | $ 14.9 |  |
Excess tax benefits on equity-based compensation awards |  | $ 5.2 | $ 0.0
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercised, total intrinsic value | $ 5.3 | $ 36.9 | $ 30.0
Shares cancelled to fund withholding tax obligations on option exercises (in shares) | 0.1 | 0.1 | 0.8
Restricted Stock and Restricted Share Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of restricted stock and restricted share units vested | $ 33.7 | $ 41.6 | $ 60.7
Shares withheld for tax purposes upon vesting of restricted share units (in shares) | 0.5 | 0.7 | 1.0
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 | $ 0.8 | $ 1.1
Shares issued, net of shares for tax withholdings (in shares) | 0.1 |  |
Stock Compensation Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued, net of shares for tax withholdings (in shares) |  | 0.1 | 0.1

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