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Capital Stock (Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions

12 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Mar. 31, 2017

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expense

$ 52.1

$ 85.6

$ 77.1

Total share-based compensation expense

68.1

88.5

79.5

Tax impact

(15.7)

(29.6)

(28.0)

^[1]

Reduction in net income

52.4

58.9

51.5

Stock Options

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expense

23.0

43.1

42.5

Restricted Share Units and Other Share-based Compensation

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expense

24.7

36.2

34.0

Share Appreciation Rights (SARs)

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Share-based compensation expense

4.4

6.3

0.6

Equity Awards

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Impact of accelerated vesting on equity awards

$ 16.0

$ 2.9

$ 2.4

^[2]

[1]	Represents the income tax benefit recognized in the statements of operations for share-based compensation arrangements.
[2]	Represents the impact of the acceleration of certain vesting schedules for equity awards pursuant to certain severance arrangements.

X

- 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

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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