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Selected Quarterly Financial Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 3,838.6 | $ 4,033.9 | $ 3,994.4 | $ 3,324.7 | $ 3,492.4 | $ 3,708.2 | $ 3,664.6 | $ 3,116.7 | $ 15,191.5 | $ 13,981.9 | $ 12,988.7
Gross profit | 614.4 | 642.0 | 641.1 | 552.6 | 577.9 | 614.3 | 610.5 | 524.5 | 2,449.9 | 2,327.2 | 2,115.8
Income (loss) from operations | 221.6 | 243.7 | 231.1 | 169.8 | 197.2 | 237.5 | 223.5 | 161.0 | 866.1 | 819.2 | 742.0
Net income | $ 195.2 | $ 129.2 | $ 141.0 | $ 57.6 | $ 103.2 | $ 125.9 | $ 117.5 | $ 77.8 | $ 523.0 | $ 424.4 | $ 403.1
Earnings per share, basic (in dollars per share) | $ 1.28 | $ 0.84 | $ 0.90 | $ 0.36 | $ 0.64 | $ 0.78 | $ 0.71 | $ 0.47 | $ 3.37 | $ 2.59 | $ 2.37
Earnings per share, diluted (in dollars per share) | 1.26 | 0.83 | 0.89 | 0.35 | 0.63 | 0.76 | 0.70 | 0.46 | 3.31 | 2.56 | 2.35
Cash dividends declared per common share (in dollars per share) | $ 0.2100 | $ 0.1600 | $ 0.1600 | $ 0.1600 | $ 0.1600 | $ 0.1075 | $ 0.1075 | $ 0.1075 | $ 0.6900 | $ 0.4825 | $ 0.3100
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,641.4 | $ 1,598.5 | $ 1,630.7 | $ 1,476.3 | $ 1,517.7 | $ 1,466.4 | $ 1,490.8 | $ 1,414.9 |  |  |
Small Business |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 314.8 | 311.5 | 321.5 | 298.7 | 291.8 | 282.5 | 288.4 | 277.4 |  |  |
Public |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 1,454.1 | 1,732.9 | 1,674.1 | 1,176.5 | 1,332.3 | 1,640.6 | 1,547.0 | 1,069.4 |  |  |
Public | Government |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 630.0 | 606.7 | 543.9 | 386.9 | 529.6 | 537.5 | 456.6 | 339.9 |  |  |
Public | Education |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 400.8 | 700.7 | 712.9 | 397.1 | 365.9 | 671.4 | 640.0 | 341.0 |  |  |
Public | Healthcare |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 423.3 | 425.5 | 417.3 | 392.5 | 436.8 | 431.7 | 450.4 | 388.5 |  |  |
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 428.3 | $ 391.0 | $ 368.1 | $ 373.2 | $ 350.5 | $ 318.7 | $ 338.4 | $ 355.0 |  |  |

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