v3.26.1
INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
INCOME TAXES        
Income tax benefit (expense) $ (42.8) $ (0.3) $ 6.9 $ (0.9)
Effective income tax rate 43.90% 0.80% 15.40% 1.50%
GPGI Holdings | GPGI Inc        
INCOME TAXES        
Ownership percentage 100.00%   100.00%