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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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