Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016
Income Statement [Abstract]
Revenues	$ 1,436.7	$ 817.2
Cost of revenues (exclusive of amortization shown below)	933.4	541.7
Gross profit	503.3	275.5
Operating expenses:
Research and development	140.0	98.0
Selling and marketing	77.5	49.2
General and administrative	68.4	44.5
Amortization of acquisition-related intangible assets	29.1	23.7
Restructuring, asset impairments and other, net	0.5	1.7
Intangible asset impairment	4.4	0.0
Total operating expenses	319.9	217.1
Operating income	183.4	58.4
Other (expense) income, net:
Interest expense	(38.4)	(15.6)
Interest income	0.6	0.3
Loss on debt refinancing and prepayment	(26.2)	0.0
Other	(4.4)	(1.4)
Other (expense) income, net	(68.4)	(16.7)
Income before income taxes	115.0	41.7
Income tax provision	(36.3)	(5.3)
Net income	78.7	36.4
Less: Net income attributable to non-controlling interest	(0.5)	(0.4)
Net income attributable to ON Semiconductor Corporation	78.2	36.0
Comprehensive income, net of tax:
Net income	78.7	36.4
Foreign currency translation adjustments	6.3	0.9
Effects of cash flow hedges	0.8	0.1
Other comprehensive income, net of tax of $0.6 million and $0.0 million, respectively	7.1	1.0
Comprehensive income	85.8	37.4
Comprehensive income attributable to non-controlling interest	(0.5)	(0.4)
Comprehensive income attributable to ON Semiconductor Corporation	$ 85.3	$ 37.0
Net income per common share attributable to ON Semiconductor Corporation:
Basic (in dollars per share)	$ 0.19	$ 0.09
Diluted (in dollars per share)	$ 0.18	$ 0.09
Weighted-average common shares outstanding:
Basic (in shares)	419.8	412.6
Diluted (in shares)	425.8	415.5