v3.26.1
SEGMENTS - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]        
Total revenue from external customers $ 9,791.3 $ 9,583.0 $ 19,062.7 $ 18,761.2
United States        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]        
Total revenue from external customers 7,575.9 7,489.2 14,583.7 14,560.9
United Kingdom        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]        
Total revenue from external customers 1,832.5 1,749.4 3,819.7 3,599.5
Canada        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]        
Total revenue from external customers $ 382.9 $ 344.4 $ 659.3 $ 600.8