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Earnings (Loss) Per Share Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share [Abstract]      
Loss attributable to Baldwin $ (33,813) $ (24,518) $ (90,141)
Weighted-average shares of Class A common stock outstanding, basic 67,938,680 63,455,148 60,134,776
Weighted-average shares of Class A common stock outstanding, diluted 67,938,680 63,455,148 60,134,776
Basic loss per share (in dollars per share) $ (0.50) $ (0.39) $ (1.50)
Diluted loss per share (in dollars per share) $ (0.50) $ (0.39) $ (1.50)