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Capital Stock (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		196 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of common shares, value	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 288.1
Share repurchase program, remaining authorized repurchase amount	$ 179.9		$ 179.9		$ 179.9
Class A Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares)	500.0		500.0		500.0	500.0
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		500.0	500.0

X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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