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v3.20.4

Business Segments Segment Reporting Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 3,950.6 | $ 3,923.9 | $ 3,399.8
Gross profit | 1,089.3 | 1,130.0 | 1,023.7
Operating Income (Loss) | 310.4 | 308.6 | 260.2
Amortization of intangible assets | 51.7 | 51.1 | 58.5
Apex |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 2,421.2 | 2,520.0 | 2,300.3
Gross profit | 710.8 | 746.0 | 687.9
Operating Income (Loss) | 276.6 | 287.7 | 262.4
Amortization | 22.9 | 20.3 | 26.2
Oxford |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 525.2 | 605.7 | 606.5
Gross profit | 209.6 | 242.9 | 248.9
Operating Income (Loss) | 43.9 | 48.4 | 54.1
Amortization | 0.7 | 3.7 | 4.2
ECS |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,004.2 | 798.2 | 493.0
Gross profit | 168.9 | 141.1 | 86.9
Operating Income (Loss) | 58.0 | 42.2 | 15.5
Amortization | $ 28.1 | $ 27.1 | $ 28.1

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