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

3 Months Ended

9 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

$ 11.1

$ 24.2

$ 41.3

$ 71.6

Total share-based compensation expense

13.5

27.1

43.7

74.5

Tax impact

^[1]

(3.2)

(8.8)

(10.1)

(24.5)

Reduction in net income

10.3

18.3

33.6

50.0

Employee Stock Options, Restricted Stock and Restricted Share Units [Member]

Share-Based Compensation Expense [Line Items]

Impact of accelerated vesting on equity awards

^[2]

2.4

2.9

2.4

2.9

Stock Options

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

4.7

11.3

18.2

35.3

Restricted Share Units and Other Share-based Compensation

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

5.9

11.2

19.8

31.5

Share Appreciation Rights (SARs)

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

$ 0.5

$ 1.7

$ 3.3

$ 4.8

[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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