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SEGMENT AND GEOGRAPHIC INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 9,646.0	$ 7,961.0	$ 7,250.0
Costs and Expenses	9,023.4	7,519.4	6,892.1
ATS
Segment Reporting Information [Line Items]
Total revenue	3,155.5	3,319.8	2,979.0
Cost of sales	2,894.9	3,044.3	2,735.1
Other segment costs	$ 116.5	$ 120.5	$ 103.6
ATS | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk
Segment Reporting Information [Line Items]
% of Total	33.00%	42.00%	41.00%
CCS Segment
Segment Reporting Information [Line Items]
Total revenue	$ 6,490.5	$ 4,641.2	$ 4,271.0
Cost of sales	5,732.1	4,136.4	3,860.0
Other segment costs	$ 279.9	$ 218.2	$ 193.4
CCS Segment | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk
Segment Reporting Information [Line Items]
% of Total	67.00%	58.00%	59.00%
CCS Segment | CCS, Communication Segment
Segment Reporting Information [Line Items]
Total revenue	$ 3,946.7	$ 2,675.6	$ 2,865.0
CCS Segment | CCS, Communication Segment | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk
Segment Reporting Information [Line Items]
% of Total	41.00%	33.00%	40.00%
CCS Segment | CCS, Enterprise Segment
Segment Reporting Information [Line Items]
Total revenue	$ 2,543.8	$ 1,965.6	$ 1,406.0
CCS Segment | CCS, Enterprise Segment | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk
Segment Reporting Information [Line Items]
% of Total	26.00%	25.00%	19.00%

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