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Capital Stock (Stock Options Activity) (Details) - Stock Options $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019 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)	8.6
Granted (in shares)	0.2
Exercised (in shares)	0.0	[1]
Forfeited or expired (in shares)	(0.4)
Outstanding, end of period (in shares)	8.4
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	$ 26.93
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares	28.07
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares	15.76
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares	33.42
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 26.70
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 11 months 19 days
Outstanding, Aggregate Intrinsic Value | $	$ 0.1
Outstanding, vested or expected to vest (in shares)	8.4
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 26.71
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years	4 years 11 months 16 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $	$ 0.1
Exercisable (in shares)	6.1
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 27.91
Exercisable, Weighted Average Remaining Contractual Term In Years	4 years 2 months 5 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)	23.5
Granted (in shares)	4.2
Exercised (in shares)	0.7
Forfeited or expired (in shares)	(0.8)
Outstanding, end of period (in shares)	26.2
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	$ 20.56
Granted, Weighted Average Exercise Price (in usd per share) | $ / shares	21.52
Exercised, Weighted Average Exercise Price (in usd per share) | $ / shares	10.78
Forfeited or expired, Weighted Average Exercise Price (in usd per share) | $ / shares	29.00
Outstanding, End of Period, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 20.72
Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 2 months 1 day
Outstanding, Aggregate Intrinsic Value | $	$ 25.4
Outstanding, vested or expected to vest (in shares)	25.8
Outstanding, vested or expected to vest, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 20.70
Outstanding, vested or expected to vest, Weighted Average Remaining Contractual Term In Years	4 years 1 month 17 days
Outstanding, vested or expected to vest, Aggregate Intrinsic Value | $	$ 25.4
Exercisable (in shares)	19.1
Exercisable, Weighted Average Exercise Price (in usd per share) | $ / shares	$ 19.72
Exercisable, Weighted Average Remaining Contractual Term In Years	2 years 8 months 27 days
Exercisable, Aggregate Intrinsic Value | $	$ 25.3
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Maximum | Class A Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)	0.1
[1] Represents less than 0.1 million shares.

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