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Capital Stock (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	182 Months Ended
	Aug. 04, 2022	Jun. 30, 2022	Mar. 31, 2022
Class A Voting Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common shares (in shares)		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
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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- Definition

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

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Amount remaining of a stock repurchase plan authorized.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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