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Capital Stock (Stock Options Activity) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Stock Options, Equity-Settled SARs and Cash-Settled SARs | Class A Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	8.4
Granted (in shares)	0.0
Exercised (in shares)	0.0
Forfeited or expired (in shares)	(1.2)
Outstanding, end of period (in shares)	7.2
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	$ 26.70
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares	0
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares	0
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares	29.58
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 26.21
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 3 months 7 days
Outstanding, Aggregate Intrinsic Value | $	$ 0.0
Outstanding, vested or expected to vest (in shares)	7.2
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 26.21
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years	4 years 3 months 7 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $	$ 0.0
Exercisable (in shares)	5.7
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 27.15
Exercisable, Weighted Average Remaining Contractual Term In Years	3 years 9 months 14 days
Exercisable, Aggregate Intrinsic Value | $	$ 0.0
Stock Options, Equity-Settled SARs and Cash-Settled SARs | 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)	26.2
Granted (in shares)	7.8
Exercised (in shares)	0.2
Forfeited or expired (in shares)	(5.3)
Outstanding, end of period (in shares)	28.5
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	$ 20.72
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares	12.52
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares	9.99
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares	17.72
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 19.03
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 9 months 14 days
Outstanding, Aggregate Intrinsic Value | $	$ 0.1
Outstanding, vested or expected to vest (in shares)	28.1
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 19.11
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years	4 years 8 months 19 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $	$ 0.1
Exercisable (in shares)	17.3
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 21.06
Exercisable, Weighted Average Remaining Contractual Term In Years	2 years 9 months 3 days
Exercisable, Aggregate Intrinsic Value | $	$ 0.0
Cash-Settled SARs | Class B Non-Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)	3.3

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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