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Capital Stock (Narrative - Share Based Compensation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			12 Months Ended
	Sep. 15, 2020	May 07, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
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
Incremental compensation expense from exchange program			$ 0.0
Excess tax deficiencies (benefit) on equity-based compensation awards			12.1	$ 11.3	$ 14.9
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised, total intrinsic value			$ 1.7	$ 0.3	$ 5.3
Shares cancelled to fund withholding tax obligations on option exercises (in shares)				0.0
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			1 year
Expiration term			5 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
Restricted Stock and Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock and restricted share units vested			$ 35.3	$ 18.7	$ 33.7
Shares withheld for tax purposes upon vesting of restricted share units (in shares)			0.9	0.4	0.5
Restricted Stock and Restricted Share Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			1 year
Restricted Stock and Restricted Share Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			4 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)			0.3	0.2	0.1
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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