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Capital Stock (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 205 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchases of common shares, value | $ 0.0 | $ 0.0 | $ 288.1 |
Share repurchase program, remaining authorized repurchase amount | $ 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
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

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