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Debt and Credit Facilities - Long-Term Debt (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions | 3 Months Ended |  |  |  |  |  |
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Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Dec. 31, 2022 CAD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Sep. 30, 2021 CAD ($) | Mar. 31, 2021 CAD ($) | Mar. 04, 2021 USD ($) $ / shares | Mar. 04, 2021 CAD ($) $ / shares
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.20% |  |  | 5.00% |  |  |  |  |  | 5.20% |  | 5.00% |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  | $ 3,012.0 |  | $ 2,850.0 |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  | (40.0) |  | (58.0) |  |  |  |
Total gross debt and lease liabilities |  |  |  |  |  |  |  |  |  | 12,812.0 |  | 17,070.0 |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of lease liabilities |  |  |  |  |  |  |  |  |  | (317.0) |  | (310.0) |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |  | (231.0) |  |  |  |
Current portion of long-term debt and lease liabilities |  |  |  |  |  |  |  |  |  | (317.0) |  | (541.0) |  |  |  |
Long-term lease liabilities |  |  |  |  |  |  |  |  |  | 2,695.0 |  | 2,540.0 |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | $ 9,800.0 |  | 13,989.0 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on lease liabilities | 0.40% |  |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on lease liabilities | 13.40% |  |  |  |  |  |  |  |  | 13.40% |  |  |  |  |  |
Unsecured long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 9,840.0 |  | $ 14,278.0 |  |  |  |
4.50% Notes, due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  | $ 182.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.50% |  |  |  |  |  |  |  | 4.50% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  |  |  | $ 231.0 |  |  |  |
2.80% Notes, due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  | $ 450.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.80% |  |  |  |  |  |  |  | 2.80% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  |  |  | $ 569.0 |  |  |  |
3.10% Notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  | $ 550.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.10% |  |  |  |  |  |  |  | 3.10% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  |  |  | $ 696.0 |  |  |  |
3.00% Series 5 Medium Term Notes, due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.00% |  |  | 3.00% |  |  |  |  |  | 3.00% |  | 3.00% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 115.0 |  | $ 699.0 |  |  |  |
7.875% Debentures, due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 275.0 |  |  | $ 275.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 7.875% |  |  | 7.875% |  |  |  |  |  | 7.875% |  | 7.875% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 381.0 |  | $ 359.0 |  |  |  |
8.20% Notes, due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 59.0 |  |  | $ 59.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 8.20% |  |  | 8.20% |  |  |  |  |  | 8.20% |  | 8.20% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 61.0 |  | $ 78.0 |  |  |  |
7.00% Debentures, due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 250.0 |  |  | $ 250.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 7.00% |  |  | 7.00% |  |  |  |  |  | 7.00% |  | 7.00% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 342.0 |  | $ 320.0 |  |  |  |
3.10% Series 6 Medium Term Notes, due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.10% |  |  | 3.10% |  |  |  |  |  | 3.10% |  | 3.10% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 79.0 |  | $ 748.0 |  |  |  |
5.00% Series 7 Medium Term Notes, Due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.00% |  |  | 5.00% |  |  |  |  |  | 5.00% |  | 5.00% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 154.0 |  | $ 1,247.0 |  |  |  |
7.15% Notes, due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 500.0 |  |  | $ 500.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 7.15% |  |  | 7.15% |  |  |  |  |  | 7.15% |  | 7.15% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 676.0 |  | $ 631.0 |  |  |  |
5.35% Notes, due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 300.0 |  |  | $ 300.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.35% |  |  | 5.35% |  |  |  |  |  | 5.35% |  | 5.35% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 161.0 |  | $ 355.0 |  |  |  |
5.95% Notes, due 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 500.0 |  |  | $ 500.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.95% |  |  | 5.95% |  |  |  |  |  | 5.95% |  | 5.95% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 675.0 |  | $ 630.0 |  |  |  |
5.95% Notes, due 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 600.0 |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.95% |  |  | 5.95% |  |  |  |  |  | 5.95% |  | 5.95% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 268.0 |  | $ 731.0 |  |  |  |
5.39% Series 4 Medium Term Notes, due 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.39% |  |  | 5.39% |  |  |  |  |  | 5.39% |  | 5.39% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 279.0 |  | $ 599.0 |  |  |  |
6.50% Notes, due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 1,150.0 |  |  | $ 1,150.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.50% |  |  | 6.50% |  |  |  |  |  | 6.50% |  | 6.50% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 1,553.0 |  | $ 1,451.0 |  |  |  |
6.80% Notes, due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 900.0 |  |  | $ 900.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.80% |  |  | 6.80% |  |  |  |  |  | 6.80% |  | 6.80% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 1,235.0 |  | $ 1,156.0 |  |  |  |
6.85% Notes, due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 750.0 |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.85% |  |  | 6.85% |  |  |  |  |  | 6.85% |  | 6.85% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 1,013.0 |  | $ 946.0 |  |  |  |
6.00% Notes, due 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 152.0 |  |  | $ 152.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.00% |  |  | 6.00% |  |  |  |  |  | 6.00% |  | 6.00% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 35.0 |  | $ 149.0 |  |  |  |
4.34% Series 5 Medium Term Notes, due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 4.34% |  |  | 4.34% |  |  |  |  |  | 4.34% |  | 4.34% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 300.0 |  | $ 300.0 |  |  |  |
4.00% Notes, due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 750.0 |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 4.00% |  |  | 4.00% |  |  |  |  |  | 4.00% |  | 4.00% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 1,011.0 |  | $ 945.0 |  |  |  |
3.95% Series 8 Medium Term Notes, due 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.95% |  |  | 3.95% |  |  |  |  |  | 3.95% |  | 3.95% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 493.0 |  | $ 493.0 |  |  |  |
3.75% Notes, due 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 750.0 |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.75% |  |  | 3.75% |  |  |  |  |  | 3.75% |  | 3.75% |  |  |  |
Total unsecured long term debt |  |  |  |  |  |  |  |  |  | $ 1,009.0 |  | $ 945.0 |  |  |  |
Debt tender offer | Unsecured long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  | 3,600.0 |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount at repayment date |  |  |  |  |  |  |  |  |  | 51.0 |  |  |  |  |  |
Non-cash charges related to accelerated amortization |  | $ 83.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of long-term debt |  | 32.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 3.00% Series 5 Medium Term Notes, due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  | $ 700.0 |  |  |  |  |  |
Interest rate | 3.00% |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | 585.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 8.20% Notes, due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 59.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 8.20% |  |  |  |  |  |  |  |  | 8.20% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes | $ 16.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 3.10% Series 6 Medium Term Notes, due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  | $ 750.0 |  |  |  |  |  |
Interest rate | 3.10% |  |  |  |  |  |  |  |  | 3.10% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | 671.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 5.00% Series 7 Medium Term Notes, Due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  | $ 1,300.0 |  |  |  |  |  |
Interest rate | 5.00% |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | 1,100.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 5.35% Notes, due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 300.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.35% |  |  |  |  |  |  |  |  | 5.35% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes | $ 178.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 5.95% Notes, due 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 600.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 5.95% |  |  |  |  |  |  |  |  | 5.95% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes | $ 401.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 6.00% Notes, due 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 142.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.00% |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes | $ 110.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer | 5.00% Series 4 Medium Term Notes, due 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  | $ 600.0 |  |  |  |  |  |
Interest rate | 5.39% |  |  |  |  |  |  |  |  | 5.39% |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  | $ 321.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption of notes | 4.50% Notes, due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  | $ 182.0 |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |
Early redemption of notes | 2.80% Notes, due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  | $ 450.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption of notes | 3.10% Notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  | $ 550.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 3.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption of notes | 6.00% Notes, due 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  | $ 152.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  | $ 10.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption of notes | 3.10% Series 5 Medium Term Notes, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750.0 |  |
Interest rate |  |  |  |  |  |  |  | 3.10% |  |  |  |  |  | 3.10% |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  |  |  |  |  |  | $ 770.0 |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.0 |  |
Loss on extinguishment of long-term debt |  |  |  |  |  |  |  |  | 12.0 |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  |  |  |  | 9.0 |  |  |  |  |  |  |
Early redemption of notes | 9.40% Notes, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  | $ 220.0 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 9.40% |  |  |  |  |  | 9.40% |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of debt repaid |  |  |  |  |  |  |  |  | 278.0 |  |  |  |  |  |  |
Repayment of notes |  |  |  |  |  |  |  | $ 230.0 | 290.0 |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  | $ 2.0 |  |  |  |  |  | $ 2.0 |  |
Loss on extinguishment of long-term debt |  |  |  |  |  |  |  |  | 10.0 |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  |  |  |  | $ 8.0 |  |  |  |  |  |  |
Early redemption of notes | 3.60% Notes, due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.60% |  |  |  |  |  |  | 3.60% |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of debt repaid |  |  |  |  |  |  | $ 951.0 |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  |  |  | $ 822.0 | 1,000.0 |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  | $ 9.0 |  |  |  |  |  |  | $ 11.0 |  |  |
Loss on extinguishment of long-term debt |  |  |  |  |  |  | 80.0 |  |  |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  |  | $ 60.0 |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes | 9.25% Debentures, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  | $ 300.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 9.25% |  |  |  |  |  |  |  | 9.25% |  |  |  |
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of debt repaid |  |  |  |  | $ 371.0 |  |  |  |  |  |  |  |  |  |  |
Repayment of notes |  |  |  | $ 314.0 | $ 388.0 |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  | $ 14.0 |  |  |  |  |  |  |  | $ 17.0 |  |  |  |
Issuance of senior unsecured notes | 3.95% Series 8 Medium Term Notes, due 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500.0
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.95% | 3.95%
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98.546
Effective yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.034% | 4.034%
Issuance of senior unsecured notes | 3.75% Notes, due 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750.0 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% | 3.75%
Current portion of longterm debt and lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance price per $100 principal amount | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 99.518 |
Effective yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.777% | 3.777%

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