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v3.23.1

Capital Stock (Stock Options Activity) (Details) - Stock Options and SARs $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2023 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) | 5.4
Granted (in shares) | 0.0
Exercised (in shares) | 0.0
Forfeited or expired (in shares) | (1.1)
Outstanding, end of period (in shares) | 4.3
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 | $ 24.34
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 | 16.81
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares | $ 26.35
Outstanding, Weighted Average Remaining Contractual Term (in years) | 2 years 1 month 28 days
Outstanding, Aggregate Intrinsic Value | $ | $ 0.2
Outstanding, vested or expected to vest (in shares) | 4.3
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares | $ 26.35
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years | 2 years 1 month 28 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $ | $ 0.2
Exercisable (in shares) | 4.1
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares | $ 26.60
Exercisable, Weighted Average Remaining Contractual Term In Years | 2 years 4 months 9 days
Exercisable, Aggregate Intrinsic Value | $ | $ 0.2
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) | 22.2
Granted (in shares) | 0.3
Exercised (in shares) | (0.4)
Forfeited or expired (in shares) | (1.6)
Outstanding, end of period (in shares) | 20.5
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 | $ 15.36
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares | 8.97
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares | 9.73
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares | 17.25
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares | $ 15.23
Outstanding, Weighted Average Remaining Contractual Term (in years) | 5 years 5 months 12 days
Outstanding, Aggregate Intrinsic Value | $ | $ 12.3
Outstanding, vested or expected to vest (in shares) | 20.5
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares | $ 15.25
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years | 5 years 5 months 8 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $ | $ 12.2
Exercisable (in shares) | 16.6
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares | $ 16.68
Exercisable, Weighted Average Remaining Contractual Term In Years | 4 years 11 months 12 days
Exercisable, Aggregate Intrinsic Value | $ | $ 5.7
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 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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