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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Feb. 28, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
RELATED PARTY TRANSACTIONS
Selling, general and administrative expenses		$ 129.8	$ 28.2	$ 291.1	$ 57.1
Related Party \| Administration Services and Office Space \| SRM
RELATED PARTY TRANSACTIONS
Selling, general and administrative expenses		$ 0.1		0.2
Related Party \| GPGI Holdings \| Fradin Consulting
RELATED PARTY TRANSACTIONS
Board advisor term	12 months
Board advisor renewal period	12 months
Annual cash retainer fee	$ 0.1
Amount of options to purchase shares of GPGI common stock with a fair market value	$ 0.2
Related Party \| GPGI Holdings \| Distributions to GPGI \| GPGI Inc
RELATED PARTY TRANSACTIONS
Related party contribution				131.7
Related Party \| GPGI Inc \| Cash Contributions for Husky Transaction \| GPGI Holdings
RELATED PARTY TRANSACTIONS
Related party contribution				2,120.3
Related Party \| GPGI Inc \| Equity contributions for Husky Transaction \| GPGI Holdings
RELATED PARTY TRANSACTIONS
Related party contribution				$ 1,143.0