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Capital Stock (Stock Options Activity) (Details) - Stock Options and SARs $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
Class A Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	4.3
Granted (in shares)	0.0
Exercised (in shares)	0.0
Forfeited or expired (in shares)	(1.9)
Outstanding, end of period (in shares)	2.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, Beginning of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 26.35
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares	0
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares	7.70
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares	30.81
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 22.96
Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 6 months 3 days
Outstanding, Aggregate Intrinsic Value | $	$ 0.1
Outstanding, vested or expected to vest (in shares)	2.4
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 22.96
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years	2 years 6 months 3 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $	$ 0.1
Exercisable (in shares)	2.4
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 22.96
Exercisable, Weighted Average Remaining Contractual Term In Years	2 years 6 months 3 days
Exercisable, Aggregate Intrinsic Value | $	$ 0.1
Class B Non-Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	20.5
Granted (in shares)	0.3
Exercised (in shares)	(0.1)
Forfeited or expired (in shares)	(2.4)
Outstanding, end of period (in shares)	18.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, Beginning of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 15.23
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares	8.88
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares	7.11
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares	26.32
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 13.73
Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 1 month 6 days
Outstanding, Aggregate Intrinsic Value | $	$ 6.4
Outstanding, vested or expected to vest (in shares)	18.3
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 13.75
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years	5 years 1 month 2 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $	$ 6.3
Exercisable (in shares)	17.6
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 13.95
Exercisable, Weighted Average Remaining Contractual Term In Years	4 years 11 months 12 days
Exercisable, Aggregate Intrinsic Value | $	$ 6.1
Maximum | Class B Non-Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)	(0.1)

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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