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CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS - Senior Unsecured Convertible Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 29, 2021
Jul. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 27, 2021
Sep. 14, 2018
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS              
Discount     $ 298.0 $ 338.7      
Deferred financing costs     (39.1) (42.1)      
Amortization of net discount (premium) on corporate borrowings to interest expense     (3.9) (22.0) $ 11.3    
Deferred financing cost write-off     $ 23.3 14.2 15.8    
2.95% Senior Secured Convertible Notes due 2024              
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS              
Principal balance             $ 600.0
Conversion amount   $ (600.0)          
Change fair value of derivative       (89.4) 23.5    
Convertible Notes due 2026              
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS              
Principal balance           $ 600.0  
Conversion amount $ (600.0)            
Derivative liability             $ 90.4
Convertible Notes              
CORPORATE BORROWINGS AND FINANCE LEASE OBLIGATIONS              
Principal balance       600.0 600.0    
Conversion amount (600.0)            
Discount 61.5     (61.5) (73.7)    
Deferred financing costs       (9.5) (11.2)    
Derivative liability       (89.9) 0.5    
Amortization of net discount (premium) on corporate borrowings to interest expense       12.2      
Deferred financing cost write-off 9.5     1.7      
Change fair value of derivative       89.4      
Reclassification to Additional Paid-in Capital $ (529.0)     (89.9)      
Carrying value       529.0 $ 515.6    
Increase to Expense (Income)       $ 103.3