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Earnings Per Share and Equity (Tables) | 9 Months Ended
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Sep. 28, 2018
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | Calculations of net income per common share attributable to ON Semiconductor are as follows (in millions, except per share data):
| Quarters Ended |  | Nine Months Ended
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Net income attributable to ON Semiconductor Corporation | $ | 166.9 |  |  | $ | 108.7 |  |  | $ | 461.8 |  |  | $ | 280.8 |
Basic weighted-average common shares outstanding | 425.5 |  |  | 422.2 |  |  | 426.1 |  |  | 421.0 |
Dilutive effect of share-based awards | 3.9 |  |  | 5.3 |  |  | 4.7 |  |  | 5.5 |
Dilutive effect of convertible notes | 5.9 |  |  | — |  |  | 10.4 |  |  | — |
Diluted weighted-average common shares outstanding | 435.3 |  |  | 427.5 |  |  | 441.2 |  |  | 426.5 |
Net income per common share attributable to ON Semiconductor Corporation: |  |  |  |  |  |  |
Basic | $ | 0.39 |  |  | $ | 0.26 |  |  | $ | 1.08 |  |  | $ | 0.67 |
Diluted | $ | 0.38 |  |  | $ | 0.25 |  |  | $ | 1.05 |  |  | $ | 0.66 |
Schedule of Share Repurchase Program | Information relating to the Share Repurchase Program during the quarter and nine months ended September 28, 2018 is as follows (in millions, except per share data):
| Quarter Ended |  | Nine Months Ended
| September 28, 2018 |  | September 28, 2018
Number of repurchased shares (1) | 3.6 |  |  | 5.3 |
Aggregate purchase price | $ | 75.0 |  |  | $ | 115.0 |
Weighted-average purchase price per share (2) | $ | 20.92 |  |  | $ | 21.7 |
(1) None of these shares had been reissued or retired as of September 28, 2018, but may be reissued or retired by the Company at a later date. (2) Exclusive of fees, commissions and other expenses.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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