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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Net sales | $ 3,957.9 | $ 3,606.4
Income (loss) from operations | 228.9 | 204.1
Depreciation and amortization expense | (64.3) | (66.6)
Operating Segments | Corporate |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,736.2 | 1,565.8
Income (loss) from operations | 134.7 | 123.0
Depreciation and amortization expense | (21.5) | (22.9)
Operating Segments | Small Business |  |
Segment Reporting Information [Line Items] |  |
Net sales | 355.6 | 327.6
Income (loss) from operations | 24.4 | 21.9
Depreciation and amortization expense | (5.6) | (5.6)
Operating Segments | Public |  |
Segment Reporting Information [Line Items] |  |
Net sales | 1,330.7 | 1,230.0
Income (loss) from operations | 76.1 | 70.2
Depreciation and amortization expense | (12.7) | (12.7)
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Net sales | 535.4 | 483.0
Income (loss) from operations | 25.6 | 19.8
Depreciation and amortization expense | (7.4) | (8.8)
Headquarters |  |
Segment Reporting Information [Line Items] |  |
Net sales | 0.0 | 0.0
Income (loss) from operations | (31.9) | (30.8)
Depreciation and amortization expense | $ (17.1) | $ (16.6)

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