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Acquisitions - (Tables) | 6 Months Ended
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Jul. 03, 2020
Business Combinations [Abstract] |
Pro Forma Information | The following unaudited pro-forma consolidated results of operation for the quarters and six months ended July 3, 2020 and June 28, 2019 have been prepared as if the acquisition of Quantenna had occurred on January 1, 2018 and includes adjustments for amortization of intangibles, interest expense from financing, restructuring, and the effect of purchase accounting adjustments including the step-up of inventory (in millions):
| Quarters Ended |  |  | Six Months Ended |
| July 3, 2020 | June 28, 2019 |  | July 3, 2020 | June 28, 2019
Revenue | $ | 1,213.5 |  | $ | 1,385.3 |  |  | $ | 2,491.4 |  | $ | 2,829.6 |
Net income (loss) | (0.9) |  | 96.7 |  |  | (13.6) |  | 198.5 |
Net income (loss) attributable to ON Semiconductor Corporation | (1.4) |  | 95.6 |  |  | (14.4) |  | 197.4 |
Net income (loss) per share of common stock attributable to ON Semiconductor Corporation: |  |  |  |  |
Basic | $ | 0.00 |  | $ | 0.23 |  |  | $ | (0.04) |  | $ | 0.48 |
Diluted | $ | 0.00 |  | $ | 0.23 |  |  | $ | (0.04) |  | $ | 0.47 |

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