v3.26.1
CONSOLIDATED STATEMENTS OF EARNINGS (Parenthetical) - Common Class B
 3 Months Ended 6 Months Ended
Jun. 30, 2026
$ / shares
Jun. 30, 2025
$ / shares
Jun. 30, 2026
$ / shares
Jun. 30, 2025
$ / shares
Net earnings (loss) per average equivalent Class B share, basic (in dollars per share) $ 31.63 $ 38.91 $ 19.96 $ 13.45
Net earnings (loss) per average equivalent Class B share, diluted (in dollars per share) $ 31.63 $ 38.91 $ 19.96 $ 13.45
Net earnings (loss) per equivalent share ratio 0.2 0.2 0.2 0.2