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SEGMENT AND CUSTOMER REPORTING - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 2,893.4 | $ 2,391.9 | $ 5,542.0 | $ 4,600.8
Total Segment Costs | 2,678.7 | 2,242.3 | 5,139.5 | 4,320.6
ATS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | 819.1 | 767.7 | 1,626.3 | 1,535.6
Cost of sales | 726.1 | 700.9 | 1,452.6 | 1,402.1
Other segment costs | $ 49.5 | $ 31.7 | $ 89.5 | $ 66.5
ATS | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
% of Total | 28.00% | 32.00% | 29.00% | 33.00%
CCS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 2,074.3 | $ 1,624.2 | $ 3,915.7 | $ 3,065.2
Cost of sales | 1,829.6 | 1,438.6 | 3,460.2 | 2,728.1
Other segment costs | $ 73.5 | $ 71.1 | $ 137.2 | $ 123.9
CCS | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
% of Total | 72.00% | 68.00% | 71.00% | 67.00%
CCS | CCS, Communication Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 1,641.2 | $ 935.2 | $ 3,068.9 | $ 1,699.4
CCS | CCS, Communication Segment | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
% of Total | 57.00% | 39.00% | 56.00% | 37.00%
CCS | CCS, Enterprise Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 433.1 | $ 689.0 | $ 846.8 | $ 1,365.8
CCS | CCS, Enterprise Segment | Revenue from Contract with Customer, Segment Benchmark | Segment Concentration Risk |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
% of Total | 15.00% | 29.00% | 15.00% | 30.00%

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