Guarantor And Non-Guarantor Statements (Notes To Consolidated Statement Of Balance Sheet) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 509,500,000		$ 486,900,000	$ 652,900,000	$ 623,300,000
Short-term investments	116,200,000		144,800,000
Receivables, net	383,400,000		357,800,000
Inventories	611,800,000		581,700,000
Short-term intercompany receivables	0		0
Other current assets	89,300,000		122,200,000
Total current assets	1,710,200,000		1,693,400,000
Property, plant and equipment, net	1,074,200,000	[1]	1,103,300,000	1,109,500,000
Goodwill	184,600,000		184,600,000	198,700,000
Intangible assets, net	223,400,000		257,000,000
Long-term intercompany receivables	0		0
Other assets	64,600,000		90,100,000
Total assets	3,257,000,000		3,328,400,000
Accounts payable	276,800,000		279,500,000
Accrued expenses	220,300,000		256,700,000
Deferred income on sales to distributors	140,500,000		134,500,000
Current portion of long-term debt	181,600,000		353,600,000
Short-term intercompany payables	0		0
Total current liabilities	819,200,000		1,024,300,000
Long-term debt	760,600,000		658,300,000
Other long-term liabilities	190,400,000		255,100,000
Long-term intercompany payables	0		0
Total liabilities	1,770,200,000		1,937,700,000
Common stock	5,200,000		5,100,000
Additional paid-in capital	3,210,800,000		3,156,400,000
Accumulated other comprehensive loss	(47,400,000)		(41,100,000)
Accumulated deficit	(1,142,100,000)		(1,292,900,000)
Less: treasury stock, at cost	(572,500,000)		(466,400,000)
Total ON Semiconductor Corporation stockholders’ equity	1,454,000,000		1,361,100,000
Non-controlling interest in consolidated subsidiary	32,800,000		29,600,000	25,300,000
Total stockholders' equity	1,486,800,000		1,390,700,000	1,493,500,000	1,388,000,000
Total liabilities and equity	3,257,000,000		3,328,400,000
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	0	0
Short-term investments	0		0
Receivables, net	0		0
Inventories	0		0
Short-term intercompany receivables	0		0
Other current assets	0		0
Total current assets	0		0
Property, plant and equipment, net	0		0
Goodwill	0		0
Intangible assets, net	0		0
Long-term intercompany receivables	0		0
Other assets	1,790,200,000		1,834,600,000
Total assets	1,790,200,000		1,834,600,000
Accounts payable	0		0
Accrued expenses	1,000,000		500,000
Deferred income on sales to distributors	0		0
Current portion of long-term debt	0		198,900,000
Short-term intercompany payables	0		0
Total current liabilities	1,000,000		199,400,000
Long-term debt	335,200,000		274,100,000
Other long-term liabilities	0		0
Long-term intercompany payables	0		0
Total liabilities	336,200,000		473,500,000
Common stock	5,200,000		5,100,000
Additional paid-in capital	3,210,800,000		3,156,400,000
Accumulated other comprehensive loss	(47,400,000)		(41,100,000)
Accumulated deficit	(1,142,100,000)		(1,292,900,000)
Less: treasury stock, at cost	(572,500,000)		(466,400,000)
Total ON Semiconductor Corporation stockholders’ equity	1,454,000,000		1,361,100,000
Non-controlling interest in consolidated subsidiary	0		0
Total stockholders' equity	1,454,000,000		1,361,100,000
Total liabilities and equity	1,790,200,000		1,834,600,000
SCI LLC [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	267,900,000		212,100,000	304,500,000	392,300,000
Short-term investments	116,200,000		144,800,000
Receivables, net	49,800,000		45,400,000
Inventories	46,700,000		34,500,000
Short-term intercompany receivables	0		0
Other current assets	17,800,000		12,900,000
Total current assets	498,400,000		449,700,000
Property, plant and equipment, net	252,300,000		272,000,000
Goodwill	111,500,000		111,700,000
Intangible assets, net	113,000,000		128,200,000
Long-term intercompany receivables	0		166,300,000
Other assets	1,600,600,000		1,431,500,000
Total assets	2,575,800,000		2,559,400,000
Accounts payable	39,100,000		24,100,000
Accrued expenses	50,800,000		53,000,000
Deferred income on sales to distributors	32,300,000		34,200,000
Current portion of long-term debt	79,300,000		80,200,000
Short-term intercompany payables	11,700,000		20,400,000
Total current liabilities	213,200,000		211,900,000
Long-term debt	396,100,000		344,100,000
Other long-term liabilities	42,200,000		29,900,000
Long-term intercompany payables	3,300,000		0
Total liabilities	654,800,000		585,900,000
Common stock	300,000		300,000
Additional paid-in capital	2,335,100,000		2,549,300,000
Accumulated other comprehensive loss	(49,200,000)		(41,000,000)
Accumulated deficit	(365,200,000)		(535,100,000)
Less: treasury stock, at cost	0		0
Total ON Semiconductor Corporation stockholders’ equity	1,921,000,000		1,973,500,000
Non-controlling interest in consolidated subsidiary	0		0
Total stockholders' equity	1,921,000,000		1,973,500,000
Total liabilities and equity	2,575,800,000		2,559,400,000
Other Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	(200,000)	0
Short-term investments	0		0
Receivables, net	0		0
Inventories	0		0
Short-term intercompany receivables	4,100,000		3,300,000
Other current assets	0		0
Total current assets	4,100,000		3,300,000
Property, plant and equipment, net	3,100,000		2,800,000
Goodwill	37,300,000		37,200,000
Intangible assets, net	0		0
Long-term intercompany receivables	0		0
Other assets	136,100,000		129,500,000
Total assets	180,600,000		172,800,000
Accounts payable	500,000		0
Accrued expenses	200,000		900,000
Deferred income on sales to distributors	0		0
Current portion of long-term debt	0		100,000
Short-term intercompany payables	0		0
Total current liabilities	700,000		1,000,000
Long-term debt	0		0
Other long-term liabilities	100,000		300,000
Long-term intercompany payables	0		0
Total liabilities	800,000		1,300,000
Common stock	50,900,000		50,900,000
Additional paid-in capital	259,800,000		259,200,000
Accumulated other comprehensive loss	0		0
Accumulated deficit	(130,900,000)		(138,600,000)
Less: treasury stock, at cost	0		0
Total ON Semiconductor Corporation stockholders’ equity	179,800,000		171,500,000
Non-controlling interest in consolidated subsidiary	0		0
Total stockholders' equity	179,800,000		171,500,000
Total liabilities and equity	180,600,000		172,800,000
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	241,600,000		274,800,000	348,600,000	231,000,000
Short-term investments	0		0
Receivables, net	333,600,000		312,400,000
Inventories	562,100,000		578,400,000
Short-term intercompany receivables	7,600,000		17,200,000
Other current assets	71,500,000		109,300,000
Total current assets	1,216,400,000		1,292,100,000
Property, plant and equipment, net	820,600,000		830,900,000
Goodwill	35,800,000		35,700,000
Intangible assets, net	132,200,000		154,700,000
Long-term intercompany receivables	3,300,000		0
Other assets	837,300,000		846,200,000
Total assets	3,045,600,000		3,159,600,000
Accounts payable	237,200,000		255,400,000
Accrued expenses	168,300,000		177,800,000
Deferred income on sales to distributors	108,200,000		100,300,000
Current portion of long-term debt	102,300,000		74,400,000
Short-term intercompany payables	0		100,000
Total current liabilities	616,000,000		608,000,000
Long-term debt	29,300,000		40,100,000
Other long-term liabilities	148,100,000		224,900,000
Long-term intercompany payables	0		166,300,000
Total liabilities	793,400,000		1,039,300,000
Common stock	201,600,000		201,600,000
Additional paid-in capital	1,402,600,000		1,402,900,000
Accumulated other comprehensive loss	(38,600,000)		(34,600,000)
Accumulated deficit	686,600,000		550,400,000
Less: treasury stock, at cost	0		0
Total ON Semiconductor Corporation stockholders’ equity	2,252,200,000		2,120,300,000
Non-controlling interest in consolidated subsidiary	0		0
Total stockholders' equity	2,252,200,000		2,120,300,000
Total liabilities and equity	3,045,600,000		3,159,600,000
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	0	0
Short-term investments	0		0
Receivables, net	0		0
Inventories	3,000,000		(31,200,000)
Short-term intercompany receivables	(11,700,000)		(20,500,000)
Other current assets	0		0
Total current assets	(8,700,000)		(51,700,000)
Property, plant and equipment, net	(1,800,000)		(2,400,000)
Goodwill	0		0
Intangible assets, net	(21,800,000)		(25,900,000)
Long-term intercompany receivables	(3,300,000)		(166,300,000)
Other assets	(4,299,600,000)		(4,151,700,000)
Total assets	(4,335,200,000)		(4,398,000,000)
Accounts payable	0		0
Accrued expenses	0		24,500,000
Deferred income on sales to distributors	0		0
Current portion of long-term debt	0		0
Short-term intercompany payables	(11,700,000)		(20,500,000)
Total current liabilities	(11,700,000)		4,000,000
Long-term debt	0		0
Other long-term liabilities	0		0
Long-term intercompany payables	(3,300,000)		(166,300,000)
Total liabilities	(15,000,000)		(162,300,000)
Common stock	(252,800,000)		(252,800,000)
Additional paid-in capital	(3,997,500,000)		(4,211,400,000)
Accumulated other comprehensive loss	87,800,000		75,600,000
Accumulated deficit	(190,500,000)		123,300,000
Less: treasury stock, at cost	0		0
Total ON Semiconductor Corporation stockholders’ equity	(4,353,000,000)		(4,265,300,000)
Non-controlling interest in consolidated subsidiary	32,800,000		29,600,000
Total stockholders' equity	(4,320,200,000)		(4,235,700,000)
Total liabilities and equity	$ (4,335,200,000)		$ (4,398,000,000)

[1] Included in property, plant and equipment are $8.7 million of fixed assets that are held-for-sale as of December 31, 2013.