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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Net sales | $ 4,389.2 | $ 3,957.9
Income (loss) from operations | 245.8 | 228.9
Depreciation and amortization expense | (91.4) | (64.3)
Operating Segments | Corporate |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,911.0 | 1,736.2
Income (loss) from operations | 127.4 | 134.7
Depreciation and amortization expense | (22.3) | (21.5)
Operating Segments | Small Business |  |
Segment Reporting Information [Line Items] |  |
Net sales | 391.5 | 355.6
Income (loss) from operations | 27.3 | 24.4
Depreciation and amortization expense | (5.8) | (5.6)
Operating Segments | Public |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,525.3 | 1,330.7
Income (loss) from operations | 112.4 | 76.1
Depreciation and amortization expense | (37.7) | (12.7)
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 561.4 | 535.4
Income (loss) from operations | 14.7 | 25.6
Depreciation and amortization expense | (8.0) | (7.4)
Headquarters |  |
Segment Reporting Information [Line Items] |  |
Net sales | 0.0 | 0.0
Income (loss) from operations | (36.0) | (31.9)
Depreciation and amortization expense | $ (17.6) | $ (17.1)

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