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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		6 Months Ended	173 Months Ended
	Sep. 14, 2021	Sep. 30, 2020	Nov. 04, 2021	Sep. 30, 2021	Mar. 31, 2021
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
Repurchases of common shares, value		$ 1.0
Class A Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares)				500.0	500.0
Repurchases of common shares, shares		0.2
Repurchases of common shares, value		$ 1.0
Repurchases of common shares, weighted average repurchase price per share		$ 5.75
Class B Non-Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares)				500.0	500.0
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of common shares, value			$ 288.1
Share repurchase program, remaining authorized repurchase amount			$ 179.9

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