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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 4,186.1 | $ 3,891.7 | $ 7,792.5 | $ 7,147.6
Income (loss) from operations | 265.5 | 230.8 | 469.6 | 401.5
Depreciation and amortization expense | (66.3) | (65.4) | (132.9) | (129.5)
Operating Segments | Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,733.8 | 1,580.1 | 3,299.6 | 3,020.7
Income (loss) from operations | 141.3 | 126.9 | 266.1 | 239.0
Depreciation and amortization expense | (20.4) | (20.8) | (41.5) | (41.7)
Operating Segments | Small Business |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 329.5 | 315.0 | 657.1 | 607.0
Income (loss) from operations | 24.6 | 19.4 | 46.9 | 36.0
Depreciation and amortization expense | (5.2) | (5.1) | (10.4) | (10.3)
Operating Segments | Public |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,635.4 | 1,632.8 | 2,865.4 | 2,786.5
Income (loss) from operations | 113.0 | 104.6 | 184.7 | 165.3
Depreciation and amortization expense | (11.3) | (11.2) | (22.5) | (22.4)
Operating Segments | Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 487.4 | 363.8 | 970.4 | 733.4
Income (loss) from operations | 21.7 | 12.5 | 41.5 | 25.1
Depreciation and amortization expense | (9.0) | (7.6) | (17.8) | (14.6)
Headquarters |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 0.0 | 0.0 | 0.0 | 0.0
Income (loss) from operations | (35.1) | (32.6) | (69.6) | (63.9)
Depreciation and amortization expense | $ (20.4) | $ (20.7) | $ (40.7) | $ (40.5)

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