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DERIVATIVE INSTRUMENTS - Narrative (Details)
€ in Millions, SFr in Millions, $ in Millions
1 Months Ended
Dec. 31, 2024
Sep. 30, 2025
USD ($)
Sep. 30, 2025
EUR (€)
Aug. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2025
EUR (€)
Apr. 30, 2025
USD ($)
Apr. 30, 2025
CHF (SFr)
Feb. 28, 2025
USD ($)
Jan. 31, 2025
USD ($)
Jan. 31, 2025
CHF (SFr)
Nov. 30, 2023
USD ($)
Jul. 26, 2023
Dec. 31, 2022
USD ($)
Nov. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Notional amount       $ 53.9         $ 191.1            
Authorized repurchase amount                       $ 294.0   $ 196.0  
Derivative, forward repurchase contracts term 1 year                            
Net investment hedge                              
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Foreign exchange risk exposure amount (in Euros) | €     € 1,705.3     € 1,593.9                  
Foreign currency translation adjustment component of accumulated other comprehensive income (loss)   $ (92.2)     $ (91.6)                    
Foreign exchange forward contracts                              
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Cash flow hedges in AOCI/(L), net of tax   (1.2)     (1.1)                    
Cash flow hedge to be reclassified during next 12 months   (1.2)                          
Foreign exchange forward contracts | Net investment hedge                              
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Notional amount   19.1     17.3                    
Foreign currency translation adjustment component of accumulated other comprehensive income (loss)   (1.2)     (1.1)                    
Cross-currency swap contracts | Net investment hedge                              
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Notional amount   883.5     1,102.5   $ 250.0 SFr 203.6   $ 750.0 SFr 676.9        
Foreign currency translation adjustment component of accumulated other comprehensive income (loss)   $ (117.5)     $ (113.2)                    
2030 Dollar Senior Secured Notes due July 2030 | Senior Notes | Switzerland, Francs                              
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Interest rate, stated percentage                   2.671% 2.671%   6.625%    
2029 Dollar Senior Secured Notes due January 2029 | Senior Notes | Switzerland, Francs                              
Derivative Instruments and Hedging Activities Disclosures [Line Items]                              
Interest rate, stated percentage             1.248% 1.248%             4.75%