SEGMENT INFORMATION - Sales by Product and Service Offering (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Segment Reporting Information [Line Items] | |||
| Revenue | $ 4,431.2 | $ 4,285.6 | $ 3,879.4 |
| Critical infrastructure & solutions | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 2,632.6 | 2,451.8 | 2,136.5 |
| Service & software solutions | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 1,298.9 | 1,276.1 | 1,215.9 |
| I.T. & Edge infrastructure | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | $ 499.7 | $ 557.7 | $ 527.0 |