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Supplementary Financial Information - Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Consolidated unaudited quarterly financial information is as follows (in millions, except per share data):
| Quarters ended in 2020
| April 3 |  | July 3 |  | October 2 |  | December 31
Revenue | $ | 1,277.9 |  |  | $ | 1,213.5 |  |  | $ | 1,317.3 |  |  | $ | 1,446.3 |
Gross Profit (exclusive of the amortization of acquisition-related intangible assets) | 402.7 |  |  | 374.3 |  |  | 441.2 |  |  | 497.6 |
Net income (loss) attributable to ON Semiconductor Corporation | (14.0) |  |  | (1.4) |  |  | 160.6 |  |  | 89.0 |
Diluted net income (loss) per common share attributable to ON Semiconductor Corporation | (0.03) |  |  | 0.00 |  |  | 0.38 |  |  | 0.21 |
| Quarters ended in 2019
| March 29 |  | June 28 |  | September 27 (1) |  | December 31
Revenue | $ | 1,386.6 |  |  | $ | 1,347.7 |  |  | $ | 1,381.8 |  |  | $ | 1,401.8 |
Gross Profit (exclusive of the amortization of acquisition-related intangible assets) | 513.7 |  |  | 499.0 |  |  | 475.2 |  |  | 485.7 |
Net income (loss) attributable to ON Semiconductor Corporation | 114.1 |  |  | 101.8 |  |  | (60.7) |  |  | 56.5 |
Diluted net income (loss) per common share attributable to ON Semiconductor Corporation | 0.27 |  |  | 0.24 |  |  | (0.15) |  |  | 0.14 |
(1) The net loss for the quarter ended September 27, 2019 was primarily due to the expensing of $169.5 million relating to the settlement of litigation with PI.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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