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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, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Excess tax deficiencies (benefit) on equity-based compensation awards | $ 11.3 | $ 14.9 | $ (5.2)
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercised, total intrinsic value | $ 0.3 | $ 5.3 | $ 36.9
Shares cancelled to fund withholding tax obligations on option exercises (in shares) | 0.0 | 0.1 | 0.1
Stock Options | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting term | 1 year |  |
Expiration term | 5 years |  |
Stock Options | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting term | 5 years |  |
Expiration term | 10 years |  |
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 | $ 18.7 | $ 33.7 | $ 41.6
Shares withheld for tax purposes upon vesting of restricted share units (in shares) | 0.4 | 0.5 | 0.7
Restricted Stock and Restricted Share Units (RSUs) | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting term | 1 year |  |
Restricted Stock and Restricted Share Units (RSUs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting term | 4 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 | $ 0.8
Shares issued, net of shares for tax withholdings (in shares) | 0.2 | 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

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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