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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Share-Based Compensation Expense [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 23.6 | $ 14.9 | $ 47.4 | $ 28.5
Total share-based compensation expense |  | 23.6 | 24.0 | 47.4 | 46.2
Tax impact | [1] | (8.3) | (8.4) | (16.8) | (16.0)
Reduction in net income |  | 15.3 | 15.6 | 30.6 | 30.2
Stock Options |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |
Share-based compensation expense |  | 11.7 | 8.5 | 24.0 | 16.2
Restricted Share Units and Other Share-based Compensation |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |
Share-based compensation expense |  | 9.9 | 6.4 | 20.2 | 12.3
Share Appreciation Rights (SARs) |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |
Share-based compensation expense |  | 2.0 | 0.0 | 3.2 | 0.0
Restricted Stock and Restricted Share Units (RSUs) | Annual Bonus Plan |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |
Immediately vested restricted share units issued under annual bonus program and impact of accelerated vesting on equity awards | [2] | 0.0 | 6.7 | 0.0 | 15.3
Employee stock options, restricted stock and restricted share units |  |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |  |
Immediately vested restricted share units issued under annual bonus program and impact of accelerated vesting on equity awards | [3] | $ 0.0 | $ 2.4 | $ 0.0 | $ 2.4
[1] | Represents the income tax benefit recognized in the statements of income for share-based compensation arrangements.
[2] | Represents the impact of immediately vested stock awards granted as part of our annual bonus program, and issued in lieu of cash bonuses.
[3] | Represents the impact of the acceleration of certain vesting schedules for equity awards pursuant to certain severance arrangements.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors, certain consultants qualifying for treatment as employees, including the impact of compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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