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Capital Stock (Restricted Share Unit Activity) (Details) shares in Millions	12 Months Ended
	Mar. 31, 2019 $ / shares shares
Restricted Share Units (RSUs) | Class A Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding (in shares)	0.2
Granted (in shares)	0.0	[1]
Vested (in shares)	(0.1)
Forfeited (in shares)	0.0	[1]
Outstanding (in shares)	0.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 28.49
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	23.51
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	29.05
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	24.83
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 25.68
Restricted Share Units (RSUs) | Class B Non-Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding (in shares)	1.5
Granted (in shares)	1.3
Vested (in shares)	(0.9)
Forfeited (in shares)	(0.3)
Outstanding (in shares)	1.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 28.71
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	19.88
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	26.14
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	23.24
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 24.01
Restricted Stock | Class B Non-Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding (in shares)	0.5
Granted (in shares)	0.0
Vested (in shares)	(0.2)
Forfeited (in shares)	0.0	[1]
Outstanding (in shares)	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 25.70
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	0
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	25.70
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	25.70
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 25.70
Minimum | Restricted Stock and Restricted Share Units (RSUs)
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
Maximum | Restricted Stock and Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Maximum | Restricted Share Units (RSUs) | Class A Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	0.1
Forfeited (in shares)	(0.1)
Maximum | Restricted Stock | Class B Non-Voting Common Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Forfeited (in shares)	(0.1)
[1] Represents less than 0.1 million shares.

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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