v3.25.4
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Senior Unsecured Convertible Notes narrative (Details)
£ in Millions, $ in Millions
12 Months Ended
Jul. 28, 2025
USD ($)
Jun. 15, 2025
USD ($)
Nov. 15, 2024
USD ($)
Nov. 15, 2024
GBP (£)
Jul. 31, 2020
USD ($)
item
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2020
Mar. 17, 2017
GBP (£)
Nov. 08, 2016
GBP (£)
Jun. 05, 2015
USD ($)
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES                        
Long-Term Debt, Gross           $ 4,024.2 $ 4,134.5          
Amortization of Debt Discount (Premium)           14.6 (17.5) $ (55.6)        
Total noncurrent carrying value of corporate borrowings and finance lease liabilities           4,065.3 4,055.8          
Debt issuance costs           64.4 47.2          
Interest expense           459.5 401.8 369.6        
Other expense           $ (112.4) 156.2 $ 76.8        
Second Lien Notes                        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES                        
Long-Term Debt, Gross         $ 1,997.4              
Amortization of Debt Discount (Premium)         $ (535.1)              
PIK interest rate         12.00%              
Number of interest periods | item         3              
Principal amount         $ 1,462.3              
Stated interest rate (as a percent)         10.00%              
Principal payments of notes $ 131.2                      
6.375% Senior Subordinated Notes due 2024                        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES                        
Debt instrument face amount | £                   £ 250.0 £ 250.0  
Stated interest rate (as a percent)         6.375%       6.375%      
Principal payments of notes     $ 5.0 £ 4.0                
5.75% Senior Subordinated Notes due 2025                        
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES                        
Long-Term Debt, Gross             $ 44.1          
Debt instrument face amount                       $ 600.0
Stated interest rate (as a percent)         5.75%   5.75%         5.75%
Principal payments of notes   $ 42.8