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REVENUE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
REVENUE (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,665.1	$ 5,899.6	$ 12,745.2	$ 11,243.3
Contract with Customer, Refund Liability	38.9		38.9		$ 33.7
Deferred Revenue, Current	208.9		208.9		$ 151.4	$ 141.8
EES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,510.7	2,257.8	4,754.9	4,323.1
CSS
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,681.2	2,265.2	5,160.1	4,265.5
UBS
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,473.2	1,376.6	2,830.2	2,654.7
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,894.9	4,386.9	9,399.5	8,361.5
CANADA
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	872.2	804.0	1,699.3	1,516.8
Non-US [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 898.0	$ 708.7	$ 1,646.4	$ 1,365.0