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OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income/(loss), net of tax $ (71.5) $ 185.3 $ 300.4 $ 65.2
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 14,427.3 15,196.5 15,124.1 15,170.3
Other comprehensive income/(loss), net of tax (71.5) 185.3 300.4 65.2
Ending balance 14,641.8 15,326.1 14,641.8 15,326.1
Total        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income/(loss), net of tax (71.5) 185.3 300.4 65.2
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (664.2) (921.9) (1,036.1) (801.8)
Other comprehensive income/(loss), net of tax (71.5) 185.3 300.4 65.2
Ending balance (735.7) (736.6) (735.7) (736.6)
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income/(loss), net of tax (72.4) 184.7 297.5 62.6
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (534.5) (792.2) (904.4) (670.1)
Other comprehensive income/(loss), net of tax (72.4) 184.7 297.5 62.6
Ending balance (606.9) (607.5) (606.9) (607.5)
Employee benefit plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income/(loss), net of tax 0.9 0.6 2.9 2.6
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (129.7) (129.7) (131.7) (131.7)
Other comprehensive income/(loss), net of tax 0.9 0.6 2.9 2.6
Ending balance $ (128.8) $ (129.1) $ (128.8) $ (129.1)