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Debt and Credit Facilities - Long-Term Debt (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 17, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 CAD ($) | Dec. 31, 2022 USD ($)
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Lease liabilities |  | $ 3,012.0 |  |  |  | $ 3,826.0 | $ 3,012.0 |  |  |
Deferred financing costs |  | (40.0) |  |  |  | (42.0) | (40.0) |  |  |
Total gross debt and lease liabilities |  | 12,812.0 |  |  |  | 14,913.0 | 12,812.0 |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |
Current portion of lease liabilities |  | (317.0) |  |  |  | (348.0) | (317.0) |  |  |
Current portion of long-term debt and lease liabilities |  | (317.0) |  |  |  | (348.0) | (317.0) |  |  |
Long-term lease liabilities |  | 2,695.0 |  |  |  | 3,478.0 | 2,695.0 |  |  |
Total long-term debt |  | 9,800.0 |  |  |  | 11,087.0 | 9,800.0 |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Borrowing costs |  |  |  |  |  | 255.0 | 168.0 |  |  |
Credit facilities available |  |  |  |  |  | $ 6,971.0 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |
Interest rate on lease liabilities |  |  |  |  |  | 0.90% |  | 0.90% |  |
Maximum |  |  |  |  |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |
Interest rate on lease liabilities |  |  |  |  |  | 13.40% |  | 13.40% |  |
Issuance of senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Principal amount | $ 1.5 |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Borrowing costs | $ 8.0 |  |  |  |  |  |  |  |  |
Debt tender offer |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | 3,600.0 |  |  |  |  |  |  |  |
Debt discount at repayment date |  | 51.0 |  |  |  |  | 51.0 |  |  |
Non-cash charges related to accelerated amortization |  | 83.0 |  |  |  |  |  |  |  |
Loss on extinguishment of long-term debt |  | 32.0 |  |  |  |  |  |  |  |
Unsecured long-term debt |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Total unsecured long term debt |  | $ 9,840.0 |  |  |  | $ 11,129.0 | $ 9,840.0 |  |  |
5.60% Series 9 Medium Term Notes, due 2025 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.60% |  | 5.60% |  |
Total unsecured long term debt |  |  |  |  |  | $ 1,000.0 |  |  |  |
5.40% Series 10 Medium Term Notes, due 2026 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.40% |  | 5.40% |  |
Total unsecured long term debt |  |  |  |  |  | $ 500.0 |  |  |  |
3.00% Series 5 Medium Term Notes, due 2026 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.00% |  |  |  | 3.00% | 3.00% | 3.00% |  | 3.00%
Total unsecured long term debt |  | $ 115.0 |  |  |  | $ 115.0 | $ 115.0 |  |  |
3.00% Series 5 Medium Term Notes, due 2026 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.00% |  |  |  |  | 3.00% |  |  | 3.00%
Principal amount |  | $ 700.0 |  |  |  |  | $ 700.0 |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | $ 585.0 |  |  |  |  |  |  |  |
7.875% Debentures, due 2026 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 7.875% |  |  |  | 7.875% | 7.875% | 7.875% |  | 7.875%
Principal amount |  |  |  |  |  |  |  | $ 275.0 |  | $ 275.0
Total unsecured long term debt |  | $ 381.0 |  |  |  | $ 369.0 | $ 381.0 |  |  |
8.20% Notes, due 2027 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 8.20% |  |  |  | 8.20% | 8.20% | 8.20% |  | 8.20%
Principal amount |  |  |  |  |  |  |  | $ 59.0 |  | $ 59.0
Total unsecured long term debt |  | $ 61.0 |  |  |  | $ 57.0 | $ 61.0 |  |  |
8.20% Notes, due 2027 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 8.20% |  |  |  |  | 8.20% |  |  | 8.20%
Principal amount |  |  |  |  |  |  |  |  |  | $ 59.0
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  | $ 16.0 |  |  |  |  |  |  |
7.00% Debentures, due 2028 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 7.00% |  |  |  | 7.00% | 7.00% | 7.00% |  | 7.00%
Principal amount |  |  |  |  |  |  |  | $ 250.0 |  | $ 250.0
Total unsecured long term debt |  | $ 342.0 |  |  |  | $ 333.0 | $ 342.0 |  |  |
3.10% Series 6 Medium Term Notes, due 2029 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.10% |  |  |  | 3.10% | 3.10% | 3.10% |  | 3.10%
Total unsecured long term debt |  | $ 79.0 |  |  |  | $ 79.0 | $ 79.0 |  |  |
3.10% Series 6 Medium Term Notes, due 2029 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.10% |  |  |  |  | 3.10% |  |  | 3.10%
Principal amount |  | $ 750.0 |  |  |  |  | $ 750.0 |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | $ 671.0 |  |  |  |  |  |  |  |
5.00% Series 7 Medium Term Notes, Due 2030 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.00% |  |  |  | 5.00% | 5.00% | 5.00% |  | 5.00%
Total unsecured long term debt |  | $ 154.0 |  |  |  | $ 154.0 | $ 154.0 |  |  |
5.00% Series 7 Medium Term Notes, Due 2030 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.00% |  |  |  |  | 5.00% |  |  | 5.00%
Principal amount |  | $ 1,300.0 |  |  |  |  | $ 1,300.0 |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | $ 1,100.0 |  |  |  |  |  |  |  |
7.15% Notes, due 2032 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 7.15% |  |  |  | 7.15% | 7.15% | 7.15% |  | 7.15%
Principal amount |  |  |  |  |  |  |  | $ 500.0 |  | $ 500.0
Total unsecured long term debt |  | $ 676.0 |  |  |  | $ 659.0 | $ 676.0 |  |  |
5.35% Notes, due 2033 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.35% |  |  |  | 5.35% | 5.35% | 5.35% |  | 5.35%
Principal amount |  |  |  |  |  |  |  | $ 300.0 |  | $ 300.0
Total unsecured long term debt |  | $ 161.0 |  |  |  | $ 153.0 | $ 161.0 |  |  |
5.35% Notes, due 2033 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.35% |  |  |  |  | 5.35% |  |  | 5.35%
Principal amount |  |  |  |  |  |  |  |  |  | $ 300.0
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  | 178.0 |  |  |  |  |  |  |
5.95% Notes, due 2034 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.95% |  |  |  | 5.95% | 5.95% | 5.95% |  | 5.95%
Principal amount |  |  |  |  |  |  |  | $ 500.0 |  | $ 500.0
Total unsecured long term debt |  | $ 675.0 |  |  |  | $ 659.0 | $ 675.0 |  |  |
5.95% Notes, due 2035 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.95% |  |  |  | 5.95% | 5.95% | 5.95% |  | 5.95%
Principal amount |  |  |  |  |  |  |  | $ 600.0 |  | $ 600.0
Total unsecured long term debt |  | $ 268.0 |  |  |  | $ 262.0 | $ 268.0 |  |  |
5.95% Notes, due 2035 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.95% |  |  |  |  | 5.95% |  |  | 5.95%
Principal amount |  |  |  |  |  |  |  |  |  | $ 600.0
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  | 401.0 |  |  |  |  |  |  |
5.39% Series 4 Medium Term Notes, due 2037 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.39% |  |  |  | 5.39% | 5.39% | 5.39% |  | 5.39%
Total unsecured long term debt |  | $ 279.0 |  |  |  | $ 279.0 | $ 279.0 |  |  |
6.50% Notes, due 2038 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.50% |  |  |  | 6.50% | 6.50% | 6.50% |  | 6.50%
Principal amount |  |  |  |  |  |  |  | $ 1,150.0 |  | $ 1,150.0
Total unsecured long term debt |  | $ 1,553.0 |  |  |  | $ 1,516.0 | $ 1,553.0 |  |  |
6.80% Notes, due 2038 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.80% |  |  |  | 6.80% | 6.80% | 6.80% |  | 6.80%
Principal amount |  |  |  |  |  |  |  | $ 900.0 |  | $ 900.0
Total unsecured long term debt |  | $ 1,235.0 |  |  |  | $ 1,204.0 | $ 1,235.0 |  |  |
6.85% Notes, due 2039 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.85% |  |  |  | 6.85% | 6.85% | 6.85% |  | 6.85%
Principal amount |  |  |  |  |  |  |  | $ 750.0 |  | $ 750.0
Total unsecured long term debt |  | $ 1,013.0 |  |  |  | $ 988.0 | $ 1,013.0 |  |  |
6.00% Notes, due 2042 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.00% |  |  |  | 6.00% | 6.00% | 6.00% |  | 6.00%
Principal amount |  |  |  |  |  |  |  | $ 152.0 |  | $ 152.0
Total unsecured long term debt |  | $ 35.0 |  |  |  | $ 42.0 | $ 35.0 |  |  |
6.00% Notes, due 2042 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.00% |  |  |  |  | 6.00% |  |  | 6.00%
Principal amount |  |  |  |  |  |  |  |  |  | $ 142.0
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  | $ 110.0 |  |  |  |  |  |  |
6.00% Notes, due 2042 | Early redemption of notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 6.00% |  |  |  |  |  |
Principal amount |  |  |  | $ 152.0 |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  | $ 10.2 |  |  |  |  |  |
4.34% Series 5 Medium Term Notes, due 2046 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.34% |  |  |  | 4.34% | 4.34% | 4.34% |  | 4.34%
Total unsecured long term debt |  | $ 300.0 |  |  |  | $ 300.0 | $ 300.0 |  |  |
4.00% Notes, due 2047 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 4.00% |  |  |  | 4.00% | 4.00% | 4.00% |  | 4.00%
Principal amount |  |  |  |  |  |  |  | $ 750.0 |  | $ 750.0
Total unsecured long term debt |  | $ 1,011.0 |  |  |  | $ 987.0 | $ 1,011.0 |  |  |
3.95% Series 8 Medium Term Notes, due 2051 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.95% |  |  |  | 3.95% | 3.95% | 3.95% |  | 3.95%
Total unsecured long term debt |  | $ 493.0 |  |  |  | $ 493.0 | $ 493.0 |  |  |
3.75% Notes, due 2051 |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.75% |  |  |  | 3.75% | 3.75% | 3.75% |  | 3.75%
Principal amount |  |  |  |  |  |  |  | $ 750.0 |  | $ 750.0
Total unsecured long term debt |  | $ 1,009.0 |  |  |  | $ 980.0 | $ 1,009.0 |  |  |
Series 9 Medium Term Notes, maturing on November 17, 2025 | Issuance of senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate | 5.60% |  |  |  |  |  |  |  |  |
Principal amount | $ 1.0 |  |  |  |  |  |  |  |  |
Series 10 Medium Term Notes, maturing on November 17, 2026 | Issuance of senior unsecured notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate | 5.40% |  |  |  |  |  |  |  |  |
Principal amount | $ 500.0 |  |  |  |  |  |  |  |  |
5.00% Series 4 Medium Term Notes, due 2037 | Debt tender offer |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.39% |  |  |  |  | 5.39% |  |  | 5.39%
Principal amount |  | $ 600.0 |  |  |  |  | $ 600.0 |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | 321.0 |  |  |  |  |  |  |  |
2.80% Notes, due 2023 | Early redemption of notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.80% |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  | $ 450.0 |  |  |  |  |  |
3.10% Notes, due 2025 | Early redemption of notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.10% |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  | $ 550.0 |  |  |  |  |  |
4.50% Notes, due 2022 | Early redemption of notes |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.50% |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  |  | $ 182.0 |  |  |  |  |
Syndicated Credit Facilities |  |  |  |  |  |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |
Credit facilities available |  | $ 3,000.0 |  |  |  |  | $ 3,000.0 |  | $ 2,800.0 |
Reduction in maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 200.0 |

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2023-01-01 -Paragraph 26 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=23&code=ifrs-tx-2023-en-r&anchor=para_26_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_7&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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