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Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			9 Months Ended	164 Months Ended
	Sep. 15, 2020	May 07, 2020	Dec. 31, 2020	Feb. 04, 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)	10.0
LGEC 2019 Performance Incentive Plan, number of shares authorized (in shares)	16.1
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
Options and SARs, existing | Class A Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exchanged (in shares)		1.1
Options and SARs, existing | Class B Non-Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exchanged (in shares)		4.3
Options and SARs, new | Class A Voting Shares
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
Options and SARs, new | Class B Non-Voting Shares
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

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