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Capital Stock (Restricted Share Unit Activity) (Details) shares in Millions	12 Months Ended
	Mar. 31, 2020 $ / 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)	0.1
Granted (in shares)	0.0
Vested (in shares)	(0.1)
Forfeited (in shares)	0.0
Outstanding (in shares)	0.0
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	$ 25.68
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	11.01
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	25.93
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	18.90
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 14.89
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)	1.6
Granted (in shares)	3.1
Vested (in shares)	(0.7)
Forfeited (in shares)	(0.3)
Outstanding (in shares)	3.7
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	$ 24.01
Granted, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	11.93
Vested, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	23.61
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	18.78
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) | $ / shares	$ 14.46
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)	0.3
Granted (in shares)	0.0
Vested (in shares)	(0.1)
Forfeited (in shares)	(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	$ 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
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)

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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).

+ References

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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.

+ References

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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