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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 4,907.7 | $ 4,373.2 | $ 13,495.5 | $ 12,165.7
Income (loss) from operations | 320.6 | 274.8 | 849.8 | 744.4
Depreciation and amortization expense | (68.2) | (65.8) | (197.5) | (198.7)
Operating Segments | Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,913.5 | 1,706.5 | 5,533.6 | 5,006.1
Income (loss) from operations | 138.9 | 125.7 | 430.8 | 388.3
Depreciation and amortization expense | (21.7) | (21.8) | (64.8) | (66.8)
Operating Segments | Small Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 386.2 | 340.0 | 1,119.2 | 997.1
Income (loss) from operations | 27.2 | 23.8 | 78.2 | 70.0
Depreciation and amortization expense | (5.6) | (5.5) | (16.8) | (16.6)
Operating Segments | Public |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 2,100.9 | 1,875.1 | 5,271.7 | 4,740.5
Income (loss) from operations | 168.4 | 136.6 | 373.9 | 318.3
Depreciation and amortization expense | (15.0) | (12.9) | (41.4) | (38.4)
Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 507.1 | 451.6 | 1,571.0 | 1,422.0
Income (loss) from operations | 21.9 | 19.2 | 66.6 | 60.7
Depreciation and amortization expense | (7.9) | (7.3) | (23.1) | (25.1)
Headquarters |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Income (loss) from operations | (35.8) | (30.5) | (99.7) | (92.9)
Depreciation and amortization expense | $ (18.0) | $ (18.3) | $ (51.4) | $ (51.8)

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