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Capital Stock (Narrative - Share Based Compensation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 12 Months Ended
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Sep. 14, 2021 | May 07, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
LGEC 2019 Performance Incentive Plan, number of additional shares authorized (in shares) | 5.0 |  |  |  |
LGEC 2019 Performance Incentive Plan, number of shares authorized (in shares) | 21.1 |  |  |  |
Incremental compensation expense from exchange program |  |  |  | $ 0.0 |
Excess tax deficiencies (benefit) on equity-based compensation awards |  |  | $ (14.9) | 12.1 | $ 11.3
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercised, total intrinsic value |  |  | $ 2.3 | $ 1.7 | $ 0.3
Stock Options | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting term |  |  | 1 year |  |
Expiration term |  |  | 7 years |  |
Stock Options | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting term |  |  | 5 years |  |
Expiration term |  |  | 10 years |  |
Shares cancelled to fund withholding tax obligations on option exercises (in shares) |  |  | 0.1 | 0.1 | 0.0
Restricted Share Units (RSUs) and Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair value of restricted stock and restricted share units vested |  |  | $ 67.8 | $ 35.3 | $ 18.7
Shares withheld for tax purposes upon vesting of restricted share units (in shares) |  |  | 2.3 | 0.9 | 0.4
Restricted Share Units (RSUs) and Restricted Stock | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting term |  |  | 1 year |  |
Restricted Share Units (RSUs) and Restricted Stock | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting term |  |  | 3 years |  |
Stock Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Other share-based compensation granted in period, fair value |  |  | $ 2.3 | $ 2.3 | $ 2.3
Shares issued, net of shares for tax withholdings (in shares) |  |  | 0.1 | 0.3 | 0.2
Class B Non-Voting Common Shares | Options and SARS, existing |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards exchanged (in shares) |  | 4.3 |  |  |
Class B Non-Voting Common Shares | Options and SARS, new |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards exchanged (in shares) |  | 0.8 |  |  |
Awards exchanged, exercise price (in USD per share) |  | $ 7.13 |  |  |
Class A Voting Common Shares | Options and SARS, existing |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards exchanged (in shares) |  | 1.1 |  |  |
Class A Voting Common Shares | Options and SARS, new |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards exchanged (in shares) |  | 0.1 |  |  |
Awards exchanged, exercise price (in USD per share) |  | $ 7.70 |  |  |

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