Segment Information (Segment Information Of Revenues, Gross Profit And Operating Income) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010
Revenues from external customers	$ 898,000,000	$ 600,700,000	$ 2,674,400,000	$ 1,734,200,000
Segment gross profit	272,000,000	261,200,000	815,800,000	758,200,000
Segment operating income (loss)	70,400,000	137,700,000	225,500,000	373,100,000
Automotive & Power Group [Member]
Revenues from external customers	149,400,000	144,600,000	452,100,000	409,700,000
Segment gross profit	54,700,000	55,600,000	164,800,000	152,300,000
Segment operating income (loss)	23,600,000	26,800,000	69,100,000	66,100,000
Computing & Consumer Group [Member]
Revenues from external customers	130,400,000	134,600,000	407,500,000	392,900,000
Segment gross profit	47,800,000	57,600,000	160,400,000	172,100,000
Segment operating income (loss)	17,000,000	26,300,000	66,200,000	78,700,000
Digital & Mixed-Signal Product Group [Member]
Revenues from external customers	156,800,000	137,300,000	451,600,000	409,800,000
Segment gross profit	88,300,000	74,000,000	251,800,000	236,500,000
Segment operating income (loss)	38,300,000	27,700,000	95,000,000	94,800,000
Standard Products Group [Member]
Revenues from external customers	166,600,000	184,200,000	516,000,000	521,800,000
Segment gross profit	54,700,000	74,000,000	186,300,000	197,300,000
Segment operating income (loss)	33,400,000	56,900,000	122,300,000	133,500,000
SANYO Semiconductor Products Group [Member]
Revenues from external customers	294,800,000	0.0	847,200,000	0
Segment gross profit	26,500,000	0.0	52,500,000	0
Segment operating income (loss)	$ (41,900,000)	$ 0.0	$ (127,100,000)	$ 0.0