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Capital Stock (Stock Option, SARs, Restricted Stock and Restricted Share Unit Activity) (Details) shares in Millions | 9 Months Ended
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Dec. 31, 2020 $ / shares shares
Class A Voting Shares | Share-based Payment Arrangement, Options and Stock Appreciation Rights (SARS) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Outstanding at March 31, 2020 (in shares) | 7.2
Granted (in shares) | 0.0
Options exercised (in shares) | 0.0
Awards canceled in exchange program (in shares) | (1.1)
Awards issued in exchange program (in shares) | 0.1
Forfeited or expired (in shares) | (0.7)
Outstanding at December 31, 2020 (in shares) | 5.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |
Outstanding at March 31, 2020, weighted average exercise price (in usd per share) | $ / shares | $ 26.21
Granted, weighted average exercise price (in usd per share) | $ / shares | 0
Options exercised, weighted average exercise price (in usd per share) | $ / shares | 0
Awards canceled in exchange program, weighted average exercise price (in usd per share) | $ / shares | 31.56
Awards issued in exchange program, weighted average exercise price (in usd per share) | $ / shares | 7.70
Forfeited or expired, weighted average exercise price (in usd per share) | $ / shares | 31.28
Outstanding at December 31, 2020, weighted average exercise price (in usd per share) | $ / shares | $ 24.20
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, 2020 (in shares) | 0.0
Granted (in shares) | 0.0
Vested (in shares) | 0.0
Awards canceled in exchange program (in shares) | 0.0
Awards issued in exchange program (in shares) | 0.0
Forfeited or expired (in shares) | 0.0
Outstanding at December 31, 2020 (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 at March 31, 2020, weighted average grant-date fair value (in usd per share) | $ / shares | $ 14.89
Granted, weighted average grant date fair value (in usd per share) | $ / shares | 9.87
Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) | $ / shares | 16.57
Awards canceled in exchange program, weighted average grant-date fair value (in usd per share) | $ / shares | 0
Awards issued in exchange program, weighted average grant-date fair value (in usd per share) | $ / shares | 0
Forfeited or expired, weighted average grant-date fair value (in usd per share) | $ / shares | 0
Outstanding at December 31, 2020, weighted average grant-date fair value (in usd per share) | $ / shares | $ 11.10
Class B Non-Voting Shares | Share-based Payment Arrangement, Options and Stock Appreciation Rights (SARS) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Outstanding at March 31, 2020 (in shares) | 28.5
Granted (in shares) | 4.9
Options exercised (in shares) | 0.0
Awards canceled in exchange program (in shares) | (4.1)
Awards issued in exchange program (in shares) | 0.8
Forfeited or expired (in shares) | (8.8)
Outstanding at December 31, 2020 (in shares) | 21.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |
Outstanding at March 31, 2020, weighted average exercise price (in usd per share) | $ / shares | $ 19.03
Granted, weighted average exercise price (in usd per share) | $ / shares | 8.74
Options exercised, weighted average exercise price (in usd per share) | $ / shares | 7.13
Awards canceled in exchange program, weighted average exercise price (in usd per share) | $ / shares | 26.49
Awards issued in exchange program, weighted average exercise price (in usd per share) | $ / shares | 7.13
Forfeited or expired, weighted average exercise price (in usd per share) | $ / shares | 16.49
Outstanding at December 31, 2020, weighted average exercise price (in usd per share) | $ / shares | $ 15.82
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, 2020 (in shares) | 3.8
Granted (in shares) | 8.1
Vested (in shares) | (2.4)
Awards canceled in exchange program (in shares) | 0.0
Awards issued in exchange program (in shares) | 0.0
Forfeited or expired (in shares) | (0.4)
Outstanding at December 31, 2020 (in shares) | 9.1
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, 2020, weighted average grant-date fair value (in usd per share) | $ / shares | $ 14.63
Granted, weighted average grant date fair value (in usd per share) | $ / shares | 7.80
Restricted stock or RSUs vested, weighted average grant-date fair value (in usd per share) | $ / shares | 14.48
Awards canceled in exchange program, weighted average grant-date fair value (in usd per share) | $ / shares | 0
Awards issued in exchange program, weighted average grant-date fair value (in usd per share) | $ / shares | 0
Forfeited or expired, weighted average grant-date fair value (in usd per share) | $ / shares | 8.82
Outstanding at December 31, 2020, weighted average grant-date fair value (in usd per share) | $ / shares | $ 8.81
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] |
Outstanding at March 31, 2020 (in shares) | 0.1
Granted (in shares) | 0.1
Vested (in shares) | (0.1)
Outstanding at December 31, 2020 (in shares) | 0.1
Maximum | 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) | 3.6

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