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Earnings Per Share and Equity - (Tables) | 6 Months Ended
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Jul. 03, 2020
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Net income (loss) per share of common stock attributable to ON Semiconductor Corporation is calculated as follows (in millions, except per share data):
| Quarters Ended |  |  |  | Six Months Ended |  |
| July 3, 2020 |  | June 28, 2019 |  | July 3, 2020 |  | June 28, 2019
Net income (loss) attributable to ON Semiconductor Corporation | $ | (1.4) |  |  | $ | 101.8 |  |  | $ | (15.4) |  |  | $ | 215.9 |
Basic weighted-average shares of common stock outstanding | 410.1 |  |  | 411.9 |  |  | 410.3 |  |  | 411.3 |
Dilutive effect of share-based awards | — |  |  | 1.9 |  |  | — |  |  | 2.6 |
Dilutive effect of convertible notes | — |  |  | 3.9 |  |  | — |  |  | 3.9 |
Diluted weighted-average shares of common stock outstanding | 410.1 |  |  | 417.7 |  |  | 410.3 |  |  | 417.8 |
Net income (loss) per share of common stock attributable to ON Semiconductor Corporation: |  |  |  |  |  |  |
Basic | $ | 0.00 |  |  | $ | 0.25 |  |  | $ | (0.04) |  |  | $ | 0.52 |
Diluted | $ | 0.00 |  |  | $ | 0.24 |  |  | $ | (0.04) |  |  | $ | 0.52 |
Schedule of Share Repurchase Program | Activity under the Share Repurchase Program during the quarter and six months ended July 3, 2020 and June 28, 2019 were as follows (in millions, except per share data):
| Quarters Ended |  |  |  | Six Months Ended |  |
| July 3, 2020 |  | June 28, 2019 |  | July 3, 2020 |  | June 28, 2019
Number of repurchased shares (1) | — |  |  | 2.6 |  |  | 3.6 |  |  | 7.0 |
Aggregate purchase price | $ | — |  |  | $ | 50.0 |  |  | $ | 65.3 |  |  | $ | 125.7 |
Fees, commissions and other expenses | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Total cash used for share repurchases | $ | — |  |  | $ | 50.0 |  |  | $ | 65.4 |  |  | $ | 125.8 |
Weighted-average purchase price per share (2) | $ | — |  |  | $ | 19.32 |  |  | $ | 18.08 |  |  | $ | 17.97 |
(1) None of these shares had been reissued or retired as of July 3, 2020, but may be reissued or retired at a later date. (2) Exclusive of fees, commissions and other expenses.

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