XML 134 R82.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Pension Plans - Reconciliation of Fair Value of Plan Assets (Detail) (United Kingdom Plan [Member], Non-financial Assets and Liabilities (Level 3 Measurement) [Member], Other Assets [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
United Kingdom Plan [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member] | Other Assets [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | $ 31.0 | $ 28.1
Realized/unrealized gains/(losses): |  |
Relating to assets still held at the reporting date | 3.5 | 1.3
Relating to assets sold during the period | 0 | 0
Purchases, issuances and settlements | 3.6 | 0.5
Exchange effect | 0.2 | 1.1
Ending balance | $ 38.3 | $ 31.0

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset exchange effect. + References No definition available. + Details
Name: | iosp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetExchangeEffect
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | iosp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainsAndLossesAbstract
Namespace Prefix: | iosp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset sold gain loss included in earnings one. + References No definition available. + Details
Name: | iosp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSoldGainLossIncludedInEarningsOne
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset still held gain loss included in earnings one. + References No definition available. + Details
Name: | iosp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetStillHeldGainLossIncludedInEarningsOne
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant