v3.26.1
EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Earnings Per Share [Abstract]            
Net income $ 342.0 $ 406.0 $ 303.7 $ 288.6 $ 748.0 $ 592.3
Basic weighted average common shares outstanding (in shares) 72.8   77.4   73.0 77.5
Effect of dilutive securities (in shares) 0.1   0.1   0.1 0.2
Diluted weighted average common shares outstanding (in USD per share) 72.9   77.5   73.1 77.7
Earnings per common share:            
Basic (in USD per share) $ 4.70   $ 3.92   $ 10.24 $ 7.64
Diluted (in USD per share) $ 4.69   $ 3.92   $ 10.23 $ 7.63