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Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  | 3 Months Ended | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2016 | Sep. 19, 2016 | Aug. 29, 2016 | Jul. 15, 2015 | Aug. 15, 2014 | Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 03, 2015 | Apr. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  | $ 25.8 | $ 3.5 |  |  |
Inventories |  |  |  |  |  | $ 0.0 |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  |  |  |  | 12 years 1 month |  |  |  |
Goodwill |  |  |  |  |  | 924.7 | $ 263.8 | $ 924.7 | 270.6 | $ 263.8 |  |
Proceeds from divestiture of business |  |  |  |  |  |  |  | 104.0 | 0.0 | 0.0 |  |
Gain on divestiture of business |  |  |  |  |  |  |  | 92.2 | 0.0 | 0.0 |  |
Inventory under production |  |  |  |  |  | 606.9 |  | 606.9 | 457.8 |  |  |
Contingent consideration |  |  |  |  |  | 18.8 |  | 18.8 | 19.6 |  |  |
Amortization of acquisition-related intangible assets |  |  |  |  |  |  |  | $ 104.8 | 135.7 | 68.4 |  |
Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  |  |  |  | 11 years |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  |  |  |  | 15 years |  |  |  |
Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  |  |  |  | 6 months |  |  |  |
Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of non-controlling interest acquired in the period (as a percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 2,532.2 |  |  |  |  |  |  |  |  |  |
Business combination, revenue recognized |  |  |  |  |  | 411.5 |  |  |  |  |  |
Business combination, net loss |  |  |  |  |  | 34.5 |  |  |  |  |  |
Inventories |  |  |  |  |  | 67.5 |  |  |  |  |  |
In-process research and development |  | 102.4 |  |  |  | 134.2 |  | $ 134.2 |  |  |  |
Discount rate (as a percent) |  |  |  |  |  |  |  | 14.50% |  |  |  |
Intangible assets acquired |  | 423.4 |  |  |  | 413.6 |  | $ 413.6 |  |  |  |
Goodwill |  | $ 733.6 |  |  |  | 656.1 |  | 656.1 |  |  |  |
Business combination, acquisition cost |  |  |  |  |  |  |  | 24.7 |  |  |  |
Revenues |  |  |  |  |  |  |  | 4,912.8 | 4,866.0 |  |  |
Net income (loss) attributable to ON Semiconductor Corporation |  |  |  |  |  |  |  | 196.6 | 58.2 |  |  |
Fairchild [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 272.7 |  | 272.7 |  |  |  |
Fairchild [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 135.5 |  | 135.5 |  |  |  |
Fairchild [Member] | Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 3.0 |  | 3.0 |  |  |  |
AXSEM [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of non-controlling interest acquired in the period (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 8.0 |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | $ 5.0 |  |  |  |  |  |  |  |
Change in Earn-out estimated fair value |  |  |  |  |  |  |  | 0.5 |  |  |  |
Aptina [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of non-controlling interest acquired in the period (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 405.4 |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  | 22.3 |  |  |  |  |
In-process research and development |  |  |  |  | 51.3 |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | 207.8 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 64.4 |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  |  |  | $ 2.9 |
Consideration placed in escrow |  |  |  |  |  | 40.0 |  | 40.0 |  |  |  |
Revenues |  |  |  |  |  |  | 209.0 |  |  |  |  |
Net income (loss) attributable to ON Semiconductor Corporation |  |  |  |  |  |  | (39.2) |  |  |  |  |
Amortization of acquisition-related intangible assets |  |  |  |  |  |  | 25.5 |  |  |  |  |
Business severance charges |  |  |  |  |  |  | 5.9 |  |  | 5.9 |  |
Consideration released from escrow |  |  |  |  |  |  |  | 1.0 | 21.2 |  |  |
Restricted cash |  |  |  |  |  | 17.8 |  | 17.8 | 18.8 |  |  |
Aptina [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 79.0 |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  | 6 years |  |  |  |  |  |  |
Aptina [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 126.5 |  |  |  |  |  |  |
Aptina [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  | 2 years |  |  |  |  |  |  |
Aptina [Member] | Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  | 6 years |  |  |  |  |  |  |
Aptina [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 2.3 |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  | 6 months |  |  |  |  |  |  |
Truesense Imaging, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of non-controlling interest acquired in the period (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Inventories |  |  |  |  |  |  |  |  |  | 4.7 |  |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  | $ 10.2
Intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 35.5
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 23.5
Revenues |  |  |  |  |  |  |  |  |  | 53.4 |  |
Net income (loss) attributable to ON Semiconductor Corporation |  |  |  |  |  |  |  |  |  | (0.3) |  |
Amortization of acquisition-related intangible assets |  |  |  |  |  |  |  |  |  | 10.4 |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | 95.7
Goodwill, tax deductible amount |  |  |  |  |  |  | $ 2.0 |  |  | 2.0 |  |
Truesense Imaging, Inc. [Member] | Scenario, Actual [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 23.5
Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of acquisition-related intangible assets |  |  |  |  |  |  |  |  |  | $ 50.8 |  |
Power Solutions Group [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 366.1 |  | 366.1 |  |  |  |
Analog Solutions Group [Member] | Fairchild [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 289.9 |  | 289.9 |  |  |  |
IGBT and Thyristor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  | $ 104.0 |  |  |  |  |  |  |  |  |
Gain on divestiture of business |  |  | 92.2 |  |  |  |  |  |  |  |  |
Inventory transferred |  |  | 4.1 |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  | 3.4 |  |  |  |  |  |  |  |  |
Proceeds deferred |  |  | $ 4.3 |  |  |  |  |  |  |  |  |
HSET Electronic Tech (Hong Kong) Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business | $ 75.0 |  |  |  |  |  |  |  |  |  |  |
Inventory under production |  |  |  |  |  | 13.9 |  | 13.9 |  |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | 4.5 |  | 4.5 | 5.0 |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 4.5 |  | $ 4.5 | $ 5.0 |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=SL65897772-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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