v3.26.3
Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Earnings Per Share [Abstract]        
Net income (loss) attributable to Mosaic $ (72.1) $ 411.4 $ (602.5) $ 1,060.2
Basic weighted average number of shares outstanding 317.9 317.4 317.8 317.2
Dilutive impact of share-based awards 0.0 2.0 0.0 1.6
Diluted weighted average number of shares outstanding 317.9 319.4 317.8 318.8
Basic net earnings (loss) per share attributable to Mosaic $ (0.23) $ 1.30 $ (1.90) $ 3.34
Diluted net earnings (loss) per share attributable to Mosaic $ (0.23) $ 1.29 $ (1.90) $ 3.33
Shares subject to issuance upon exercise of stock options excluded from the calculation of diluted earnings per share 2.1 0.0 2.0 0.0