FAIR VALUE MEASUREMENTS - Fair value on a recurring basis (Details) - USD ($) $ in Millions	Dec. 31, 2025	Jul. 01, 2025	Dec. 31, 2024
6.00%/8.00% Cash/PIK Toggle Senior Secured Exchangeable Notes due 2030
Corporate Borrowings:
Bifurcated embedded derivative	$ 12.6	$ 88.3	$ 157.6
New exchangeable notes
Corporate Borrowings:
Bifurcated embedded derivative	131.9	$ 41.7
Recurring basis
Corporate Borrowings:
Total liabilities at fair value	144.5		157.6
Recurring basis \| 6.00%/8.00% Cash/PIK Toggle Senior Secured Exchangeable Notes due 2030
Corporate Borrowings:
Bifurcated embedded derivative	12.6		157.6
Recurring basis \| New exchangeable notes
Corporate Borrowings:
Bifurcated embedded derivative	131.9
Recurring basis \| Significant unobservable inputs (Level 3)
Corporate Borrowings:
Total liabilities at fair value	144.5		157.6
Recurring basis \| Significant unobservable inputs (Level 3) \| 6.00%/8.00% Cash/PIK Toggle Senior Secured Exchangeable Notes due 2030
Corporate Borrowings:
Bifurcated embedded derivative	12.6		$ 157.6
Recurring basis \| Significant unobservable inputs (Level 3) \| New exchangeable notes
Corporate Borrowings:
Bifurcated embedded derivative	$ 131.9

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.