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Capital Stock (Stock Option, SARs, Restricted Stock and Restricted Share Unit Activity) (Details) shares in Millions | 6 Months Ended
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Sep. 30, 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) | (0.9) |
Outstanding at September 30, 2019 (in shares) | 7.5 |
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 | 30.41 |
Outstanding at September 30, 2019, weighted average exercise price (in usd per share) | $ / shares | $ 26.28 |
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 September 30, 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 | 26.24 |
Forfeited or expired, weighted average grant-date fair value (in usd per share) | $ / shares | 19.58 |
Outstanding at September 30, 2019, weighted average grant-date fair value (in usd per share) | $ / shares | $ 15.33 |
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) | 7.1 | [2]
Options exercised (in shares) | (0.1) |
Forfeited or expired (in shares) | (1.8) |
Outstanding at September 30, 2019 (in shares) | 31.4 |
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 | 12.44 |
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 | 25.49 |
Outstanding at September 30, 2019, weighted average exercise price (in usd per share) | $ / shares | $ 18.57 |
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) | 2.8 |
Vested (in shares) | (0.4) |
Forfeited or expired (in shares) | (0.2) |
Outstanding at September 30, 2019 (in shares) | 4.1 |
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 | $ 24.24 |
Granted, weighted average grant date fair value (in usd per share) | $ / shares | 12.45 |
Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) | $ / shares | 23.34 |
Forfeited or expired, weighted average grant-date fair value (in usd per share) | $ / shares | 22.44 |
Outstanding at September 30, 2019, weighted average grant-date fair value (in usd per share) | $ / shares | $ 16.51 |
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 September 30, 2019 (in shares) | 0.1 |
[1] | Represents less than 0.1 million shares.
[2] | During the six months ended September 30, 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 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. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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