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Financial Instruments (Schedule Of Net Foreign Exchange Positions) (Details) (Foreign Exchange Contract [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments [Line Items]    
Buy (Sell) $ (6.3)onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet $ 20.9onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
Notional Amount 145.7invest_DerivativeNotionalAmount 101.7invest_DerivativeNotionalAmount
Euro [Member]
   
Financial Instruments [Line Items]    
Buy (Sell) (31.2)onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_EUR
(30.5)onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_EUR
Notional Amount 31.2invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_EUR
30.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_EUR
Japanese Yen [Member]
   
Financial Instruments [Line Items]    
Buy (Sell) (42.1)onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_JPY
(6.7)onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_JPY
Notional Amount 42.1invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_JPY
6.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_JPY
Malaysian Ringgit [Member]
   
Financial Instruments [Line Items]    
Buy (Sell) 39.2onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_MYR
35.8onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_MYR
Notional Amount 39.2invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_MYR
35.8invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_MYR
Philippine Peso [Member]
   
Financial Instruments [Line Items]    
Buy (Sell) 16.7onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_PHP
11.7onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_PHP
Notional Amount 16.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_PHP
11.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= currency_PHP
Other Currencies [Member]
   
Financial Instruments [Line Items]    
Buy (Sell) 11.1onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= onnn_OtherCurrenciesMember
10.6onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= onnn_OtherCurrenciesMember
Notional Amount $ 16.5invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= onnn_OtherCurrenciesMember
$ 17.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis
= onnn_OtherCurrenciesMember