XML 76 R6.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Accumulated Other Comprehensive Loss (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] |  |  |
Unrealized gains on derivative instruments, tax | $ 0 | $ 0 | $ 0
Unrecognized actuarial net losses, tax | $ 36.9 | $ 36.2 | $ 18.9

X
- Definition Tax effect on the total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References No definition available. + Details
Name: | iosp_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanActuarialNetGainsLossesTaxes
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax effect on accumulated change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's deferred hedging gains or losses. + References No definition available. + Details
Name: | iosp_AccumulatedOtherComprehensiveIncomeUnrealizedGainLossOnDerivativesTax
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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