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Share Capital and Warrants - Additional Information (Detail) - CAD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Jun. 14, 2023 | Feb. 14, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 07, 2024 | Dec. 31, 2022
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Maximum percentage of preferred stock upon issuance or outstanding of common stock |  |  |  | 20.00% |  |  |
NCIB, shares redeemed, amount |  |  |  | $ 1,445.0 | $ 1,061.0 |  |
NCIB, reduction to contributed surplus |  |  |  | 966.0 | $ 688.0 |  |
Purchased and Cancelled |  |  |  | $ 87.0 |  |  |
Stock Option Plan |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares available for future issuance (in shares) | 48,800,000 |  |  | 48,800,000 | 45,500,000 |  |
Common Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) |  |  |  |  |  | 127,500,000 |
Purchase of Common Shares under NCIB |  |  |  | 55,861,000 | 43,611,000 |  |
Shares outstanding (in shares) | 1,825,038,000 |  |  | 1,825,038,000 | 1,871,868,000 |  | 1,909,190,000
Issued capital | $ 15,659.0 |  |  | $ 15,659.0 | $ 16,031.0 |  | $ 16,320.0
Common Shares | Renewed NCIB |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Purchase of Common Shares under NCIB |  |  |  | 55,900,000 | 43,600,000 |  |
Average carrying value |  |  |  | $ 939.0 | $ 688.0 |  |
Taxes paid |  |  |  | $ 27.0 | $ 0.0 |  |
Common Shares | Renewed NCIB | Potential ordinary share transactions |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
NCIB, shares authorized for repurchase (in shares) |  |  | 124,900,000 |  |  |  |
Purchase of Common Shares under NCIB |  |  | 1,500,000 |  |  |  |
NCIB, shares redeemed, amount |  |  | $ 32.0 |  |  |  |
Common Shares | Original NCIB |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
NCIB, shares repurchased, price per share (in CAD per share) |  |  |  | $ 25.38 | $ 24.32 |  |
NCIB, shares redeemed, amount |  |  |  | $ 1,400.0 | $ 1,100.0 |  |
NCIB, reduction to contributed surplus |  |  |  | $ 966.0 | $ 688.0 |  |
Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
NCIB, shares redeemed, amount | $ 250.0 |  |  |  |  |  |
Shares outstanding (in shares) | 26,000,000 |  |  | 26,000,000 | 36,000,000 |  | 36,000,000
Issued capital | $ 356.0 |  |  | $ 356.0 | $ 519.0 |  | $ 519.0
Preferred shares, price per share (in CAD per share) | $ 25.00 |  |  | $ 25.00 |  |  |
Retained earnings | $ 87.0 |  |  | $ 87.0 |  |  |
Purchases and cancelled (in shares) |  |  |  | 10,000,000 | 0 |  |
Purchased and Cancelled |  |  |  | $ 163.0 | $ 0.0 |  |
Preferred Shares | Series 3 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 10,000,000.0 |  |  | 10,000,000.0 |  |  |
Preferred Shares | First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |  |
Redeemable preferred shares, price per share |  |  |  | $ 25.00 |  |  |
Preferred Shares | Series 1 And 2 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |  |
Preferred Shares | Series 5 and 6 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |  |
Preferred Shares | Series 7 and 8 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |  |
Preferred Shares | Series 1, 3, 5, 7 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Redeemable preferred shares, conversion term |  |  |  | 5 years |  |  |
Preferred Shares | Series 1 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 10,740,000 |  |  | 10,740,000 |  |  |
Preferred Shares | Series 1 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Dividend rate, basis spread | 173.00% |  |  | 173.00% |  |  |
Preferred Shares | Series 5 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 8,000,000 |  |  | 8,000,000 |  |  |
Preferred Shares | Series 5 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Dividend rate, basis spread | 357.00% |  |  | 357.00% |  |  |
Preferred Shares | Series 7 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 6,000,000 |  |  | 6,000,000 |  |  |
Preferred Shares | Series 7 First Preferred Shares | Government of Canada Bond |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Dividend rate, basis spread | 352.00% |  |  | 352.00% |  |  |
Preferred Shares | Series 2 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 1,260,000 |  |  | 1,260,000 |  |  |
Preferred Shares | Series 2 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Dividend rate, basis spread | 173.00% |  |  | 173.00% |  |  |
Preferred Shares | Series 6 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Dividend rate, basis spread | 357.00% |  |  | 357.00% |  |  |
Preferred Shares | Series 8 First Preferred Shares | 90-Day Government of Canada Treasury Bills |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Dividend rate, basis spread | 352.00% |  |  | 352.00% |  |  |
Preferred Shares | Series 2,4,6,8 First Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Redeemable preferred shares, price per share |  |  |  | $ 25.50 |  |  |
Second Preferred Shares |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 0 |  |  | 0 | 0 |  |
Common Share Warrants |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |
Shares outstanding (in shares) | 3,643,000 |  |  | 3,643,000 | 7,625,000 |  | 55,720,000
Issued capital | $ 12.0 |  |  | $ 12.0 | $ 25.0 |  | $ 184.0
Exercise price of warrants issued (in CAD per share) |  |  |  | $ 6.54 |  |  |
Purchases and cancelled (in shares) |  | 45,500,000 |  | 0 | 45,485,000 |  |
Purchase price, warrants, per share |  | $ 22.18 |  |  |  |  |
Purchased and Cancelled |  | $ 711.0 |  | $ 0.0 | $ 151.0 |  |
Decrease through repurchase and cancellation of warrants, equity |  | 560.0 |  |  |  |  |
Decrease through repurchase and cancellation of warrants, transaction costs, equity |  | $ 2.0 |  |  |  |  |

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