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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, 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