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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, 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)