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Segment Information (Revenues By Geographic Location Including Local Sales And Exports) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Revenues $ 870.8us-gaap_Revenues $ 706.5us-gaap_Revenues
United States [Member]    
Revenues 131.8us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		 112.0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Japan [Member]    
Revenues 62.6us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP		 65.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP
Hong Kong [Member]    
Revenues 191.2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_HK		 202.7us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_HK
Singapore [Member]    
Revenues 316.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_SG		 180.4us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_SG
United Kingdom [Member]    
Revenues 129.7us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 117.2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Other [Member]    
Revenues $ 39.2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= onnn_OtherAsiaAndPacificMember		 $ 28.9us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= onnn_OtherAsiaAndPacificMember