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Debt - Exchangeable Senior Debentures (Details) - USD ($) | Jul. 02, 2024 | Feb. 28, 2023 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Margin loan facility |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Repayment of debt | $ 540,000,000 |  |  |  |  |
3.125% Exchangeable senior debentures due 2053 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Principal amount |  | $ 1,265,000,000 |  |  |  |
Interest rate (as a percent) | 3.125% | 3.125% | 3.125% | 3.125% |  |
Shares attributable to debentures per $1,000 original principal amount of Debentures |  | 1.8901 |  |  |  |
Debt instrument, face amount per debenture |  | $ 1,000 |  |  |  |
Total shares attributable to debentures |  | 2,390,977 |  |  |  |
Exchange price of shares attributable to debentures |  | $ 529.07 |  |  |  |
Percentage of redemption and purchase price |  | 100.00% |  |  |  |
Debt instrument, repurchased face amount | $ 300,000,000 |  |  |  |  |
Exchangeable senior debentures option |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Principal amount | 60,000,000 | $ 165,000,000 |  |  |  |
3.125% Exchangeable senior debentures due 2054 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Principal amount | $ 860,000,000 |  |  |  |  |
Interest rate (as a percent) | 3.125% |  | 3.125% |  |  |
Shares attributable to debentures per $1,000 original principal amount of Debentures | 2.5442 |  |  |  |  |
Debt instrument, face amount per debenture | $ 1,000 |  |  |  |  |
Total shares attributable to debentures | 2,188,012 |  |  |  |  |
Exchange price of shares attributable to debentures | $ 393.05 |  |  |  |  |
Percentage of redemption and purchase price | 100.00% |  |  |  |  |
2.75% Exchangeable senior debentures due 2050 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 2.75% | 2.75%
1.25% Exchangeable senior debentures due 2050 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 1.25% |
1.75% Exchangeable senior debentures due 2046 |  |  |  |  |  |
Debt disclosures |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 1.75% | 1.75%

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