Income Tax Expense (Benefit), Excess Tax Deficiencies (Benefit) from Share-based Compensation

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Fair Value

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Shares Withheld for Tax Purposes Upon Vesting of Restricted Share Units

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations in Period, Funding of Tax Withholding Obligations

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period, Net of Shares for Tax Withholdings

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- Definition

Share-based Payment Arrangement, Expense from Exchange Program

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Awards Exchanged in Period, Gross

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Awards Exchanged in Period, Weighted Average Exercise Price

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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://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Capital Stock (Narrative - Share Based Compensation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	May 07, 2020	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense from exchange program				$ 0.0
Excess tax deficiencies (benefit) on equity-based compensation awards		$ 11.3	$ (14.9)	12.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, total intrinsic value		$ 1.2	$ 2.3	$ 1.7
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term		1 year
Expiration term		7 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term		5 years
Expiration term		10 years
Shares cancelled to fund withholding tax obligations on option exercises (in shares)		0.1	0.1	0.1
Restricted Share Units (RSUs) and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock and restricted share units vested		$ 54.9	$ 67.8	$ 35.3
Shares withheld for tax purposes upon vesting of restricted share units (in shares)		2.2	2.3	0.9
Restricted Share Units (RSUs) and Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term		1 year
Restricted Share Units (RSUs) and Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term		3 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	$ 2.3
Shares issued, net of shares for tax withholdings (in shares)		0.3	0.1	0.3
Class B Non-Voting Common Shares \| Options and SARS, existing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exchanged (in shares)	4.3
Class B Non-Voting Common Shares \| Options and SARS, new
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exchanged (in shares)	0.8
Awards exchanged, exercise price (in USD per share)	$ 7.13
Class A Voting Common Shares \| Options and SARS, existing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exchanged (in shares)	1.1
Class A Voting Common Shares \| Options and SARS, new
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exchanged (in shares)	0.1
Awards exchanged, exercise price (in USD per share)	$ 7.70