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Capital Stock (Stock Option, SARs, Restricted Stock and Restricted Share Unit Activity) (Details)
shares in Millions

9 Months Ended

Dec. 31, 2019

$ / shares

shares

Class A Voting Shares | Stock Options and Equity-Settled SARs

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]

Outstanding at March 31, 2019 (in shares)

8.4

Granted (in shares)

0.0

Options exercised (in shares)

0.0

Forfeited or expired (in shares)

(1.1)

Outstanding at December 31, 2019 (in shares)

7.3

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]

Outstanding at March 31, 2019, weighted average exercise price (in usd per share) | $ / shares

$ 26.70

Granted, weighted average exercise price (in usd per share) | $ / shares

0

Options exercised, weighted average exercise price (in usd per share) | $ / shares

0

Forfeited or expired, weighted average exercise price (in usd per share) | $ / shares

29.94

Outstanding at December 31, 2019, weighted average exercise price (in usd per share) | $ / shares

$ 26.22

Class A Voting Shares | Restricted Stock and Restricted Share Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

Outstanding at March 31, 2019 (in shares)

0.1

Granted (in shares)

0.0

^[1]

Vested (in shares)

(0.1)

Forfeited or expired (in shares)

0.0

^[1]

Outstanding at December 31, 2019 (in shares)

0.0

^[1]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]

Outstanding at March 31, 2019, 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

Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) | $ / shares

25.93

Forfeited or expired, weighted average grant-date fair value (in usd per share) | $ / shares

18.90

Outstanding at December 31, 2019, weighted average grant-date fair value (in usd per share) | $ / shares

$ 14.89

Class B Non-Voting Shares | Stock Options and Equity-Settled SARs

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]

Outstanding at March 31, 2019 (in shares)

26.2

Granted (in shares)

7.5

^[2]

Options exercised (in shares)

(0.1)

Forfeited or expired (in shares)

(4.2)

Outstanding at December 31, 2019 (in shares)

29.4

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]

Outstanding at March 31, 2019, weighted average exercise price (in usd per share) | $ / shares

$ 20.72

Granted, weighted average exercise price (in usd per share) | $ / shares

12.71

Options exercised, weighted average exercise price (in usd per share) | $ / shares

10.50

Forfeited or expired, weighted average exercise price (in usd per share) | $ / shares

17.82

Outstanding at December 31, 2019, weighted average exercise price (in usd per share) | $ / shares

$ 19.06

Class B Non-Voting Shares | Share Appreciation Rights (SARs)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

Granted (in shares)

3.3

Class B Non-Voting Shares | Restricted Stock and Restricted Share Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

Outstanding at March 31, 2019 (in shares)

1.9

Granted (in shares)

3.1

Vested (in shares)

(0.7)

Forfeited or expired (in shares)

(0.3)

Outstanding at December 31, 2019 (in shares)

4.0

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]

Outstanding at March 31, 2019, weighted average grant-date fair value (in usd per share) | $ / shares

$ 24.24

Granted, weighted average grant date fair value (in usd per share) | $ / shares

12.03

Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) | $ / shares

24.22

Forfeited or expired, weighted average grant-date fair value (in usd per share) | $ / shares

20.86

Outstanding at December 31, 2019, weighted average grant-date fair value (in usd per share) | $ / shares

$ 15.10

Maximum | Class A Voting Shares | Restricted Stock and Restricted Share Units (RSUs)

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

^[1]

Forfeited or expired (in shares)

(0.1)

Outstanding at December 31, 2019 (in shares)

0.1

[1]	Represents less than 0.1 million shares.
[2]	During the nine months ended December 31, 2019, the Company granted 3.3 million cash-settled share-appreciation rights ("CSARs"). The CSARs are revalued each reporting period until settlement using a closed-form option pricing model (Black Scholes).

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- Definition

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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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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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