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Earnings Per Share and Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Net Income Per Share | Calculations of net income per common share attributable to ON Semiconductor Corporation are as follows (in millions, except per share data):
|  | Year ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Net income attributable to ON Semiconductor Corporation |  | $ | 211.7 |  |  | $ | 627.4 |  |  | $ | 810.7 |
Basic weighted average common shares outstanding |  | 410.9 |  |  | 423.8 |  |  | 421.9 |
Add: Incremental shares for: |  |  |  |  |  |
Dilutive effect of share-based awards |  | 1.9 |  |  | 4.3 |  |  | 5.5 |
Dilutive effect of convertible notes |  | 3.2 |  |  | 7.8 |  |  | 0.9 |
Diluted weighted average common shares outstanding |  | 416.0 |  |  | 435.9 |  |  | 428.3 |
Net income per common share attributable to ON Semiconductor Corporation: |  |  |  |  |  |
Basic |  | $ | 0.52 |  |  | $ | 1.48 |  |  | $ | 1.92 |
Diluted |  | $ | 0.51 |  |  | $ | 1.44 |  |  | $ | 1.89 |
Schedule of Share Repurchase Program | Information relating to the Company's 2018 and 2014 Share Repurchase Programs is as follows (in millions, except per share data):
|  | Year ended December 31, |  |  |  |
|  | 2019 |  | 2018 |  | 2017
Number of repurchased shares (1) |  | 7.8 |  |  | 16.8 |  |  | 1.6 |
Aggregate purchase price |  | $ | 138.9 |  |  | $ | 315.0 |  |  | $ | 25.0 |
Fees, commissions and other expenses |  | 0.1 |  |  | 0.3 |  |  | — |
Total cash used for share repurchases |  | $ | 139.0 |  |  | $ | 315.3 |  |  | $ | 25.0 |
Weighted-average purchase price per share |  | $ | 17.89 |  |  | $ | 18.78 |  |  | $ | 15.35 |
Available for future purchases at period end |  | $ | 1,361.1 |  |  | $ | 1,500.0 |  |  | $ | 603.2 |
_______________________ (1) None of these shares had been reissued or retired as of December 31, 2019, but may be reissued or retired by the Company at a later date.

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