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CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Exchangeable Notes (Details) - USD ($)
$ in Millions
5 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 22, 2024
Debt Instrument, Redemption [Line Items]            
Discount $ (171.3) $ (171.3) $ (171.3) $ 104.2    
Debt issuance costs (47.2) (47.2) (47.2) (31.1)    
Accrued paid-in-kind interest 1.5 1.5 1.5      
Derivative liability 157.6 157.6 157.6      
Amortization of deferred financing costs to interest expense     8.3 9.6 $ 12.6  
Amortization of net discount (premium) on corporate borrowings to interest expense     (17.5) (55.6) $ (65.4)  
Derivative liability     75.8      
Carrying value of corporate borrowings 4,134.5 4,134.5 4,134.5 $ 4,504.3    
Exchangeable Notes            
Debt Instrument, Redemption [Line Items]            
Debt instrument face amount 427.6 427.6 427.6     $ 414.4
Discount (117.9) (117.9) (117.9)     (120.8)
Debt issuance costs (23.3) (23.3) (23.3)     (23.2)
Accrued paid-in-kind interest 1.5 1.5 1.5     23.9
Derivative liability 157.6 157.6 157.6     233.4
Carrying value (57.6)          
Debt instrument, Principal, (increase) decrease to net earnings (loss) 13.2          
Additional Deferred Charges   (0.7)        
Deferred charges, debt issuance costs   (0.7)        
Amortization of deferred financing costs to interest expense 0.6          
Amortization of net discount (premium) on corporate borrowings to interest expense 2.9          
Accrued paid-in-kind interest, (Increase) decrease to net earnings (loss) 1.5          
Derivative liability (75.8)          
Carrying value of corporate borrowings $ 445.5 $ 445.5 $ 445.5     $ 503.8