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CONSOLIDATED STATEMENTS OF EARNINGS (Parenthetical) - Common Class B
 3 Months Ended 6 Months Ended
Jun. 30, 2025
$ / shares
Jun. 30, 2024
$ / shares
Jun. 30, 2025
$ / shares
Jun. 30, 2024
$ / shares
Net earnings (loss) per average equivalent Class B share, basic (in dollars per share) $ 38.91 $ (34.38) $ 13.45 $ (18.16)
Net earnings (loss) per average equivalent Class B share, diluted (in dollars per share) $ 38.91 $ (34.38) $ 13.45 $ (18.16)
Net earnings (loss) per equivalent share ratio 0.2 0.2 0.2 0.2