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

3 Months Ended

9 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2019

Dec. 31, 2018

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

$ 17.2

$ 11.1

$ 41.0

$ 41.3

Total share-based compensation expense

17.2

13.5

41.3

43.7

Tax impact

^[1]

(3.6)

(3.2)

(8.7)

(10.1)

Reduction in net income

13.6

10.3

32.6

33.6

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

Share-Based Compensation Expense [Line Items]

Impact of accelerated vesting on equity awards

^[2]

0.0

2.4

0.3

2.4

Stock Options

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

5.5

4.7

14.3

18.2

Restricted Share Units and Other Share-based Compensation

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

9.8

5.9

23.1

19.8

Share Appreciation Rights (SARs)

Share-Based Compensation Expense [Line Items]

Share-based compensation expense

$ 1.9

$ 0.5

$ 3.6

$ 3.3

[1]	Represents the income tax benefit recognized in the unaudited condensed consolidated 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.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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