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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities      
Net income $ 84.1us-gaap_NetIncomeLoss $ 77.8us-gaap_NetIncomeLoss $ 66.9us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 29.1us-gaap_DepreciationDepletionAndAmortization [1] 20.4us-gaap_DepreciationDepletionAndAmortization [1] 11.5us-gaap_DepreciationDepletionAndAmortization [1]
Impairment of Octane Additives segment goodwill 0us-gaap_GoodwillImpairmentLoss 1.3us-gaap_GoodwillImpairmentLoss 1.2us-gaap_GoodwillImpairmentLoss
Deferred taxes 5.8us-gaap_DeferredIncomeTaxesAndTaxCredits 5.8us-gaap_DeferredIncomeTaxesAndTaxCredits 12.1us-gaap_DeferredIncomeTaxesAndTaxCredits
Excess tax benefit from stock based payment arrangements (0.4)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (3.8)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (2.2)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Cash contributions to defined benefit pension plans (11.6)us-gaap_PensionContributions (11.0)us-gaap_PensionContributions (9.4)us-gaap_PensionContributions
Non-cash expense of defined benefit pension plans 3.8us-gaap_PensionExpense 3.0us-gaap_PensionExpense 2.0us-gaap_PensionExpense
Stock option compensation 2.6us-gaap_ShareBasedCompensation 2.5us-gaap_ShareBasedCompensation 3.1us-gaap_ShareBasedCompensation
Repayment of promissory note in civil complaint settlement (5.0)iosp_IssueRepaymentOfPromissoryNote (5.0)iosp_IssueRepaymentOfPromissoryNote (5.0)iosp_IssueRepaymentOfPromissoryNote
Changes in assets and liabilities, net of effects of acquired and divested companies:      
Trade and other accounts receivable (0.9)us-gaap_IncreaseDecreaseInReceivables (1.4)us-gaap_IncreaseDecreaseInReceivables (14.1)us-gaap_IncreaseDecreaseInReceivables
Inventories (11.1)us-gaap_IncreaseDecreaseInInventories (10.1)us-gaap_IncreaseDecreaseInInventories (1.0)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses (1.3)us-gaap_IncreaseDecreaseInPrepaidExpense (0.5)us-gaap_IncreaseDecreaseInPrepaidExpense 0.1us-gaap_IncreaseDecreaseInPrepaidExpense
Accounts payable and accrued liabilities 0.5us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (4.4)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (5.5)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accrued income taxes 14.9us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (14.7)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 1.0us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Fair value of contingent consideration (1.9)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Plant closure provisions 1.9us-gaap_IncreaseDecreaseInRestructuringReserve 1.9us-gaap_IncreaseDecreaseInRestructuringReserve 1.8us-gaap_IncreaseDecreaseInRestructuringReserve
Unrecognized tax benefits (6.8)iosp_IncreaseDecreaseInUnrecognizedTaxBenefits 0.2iosp_IncreaseDecreaseInUnrecognizedTaxBenefits 0.2iosp_IncreaseDecreaseInUnrecognizedTaxBenefits
Other non-current assets and liabilities 2.6us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet (0.7)us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet (1.4)us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet
Net cash provided by/(used in) operating activities 106.3us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 61.3us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 61.3us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities      
Capital expenditures (13.5)us-gaap_PaymentsToAcquireProductiveAssets (11.0)us-gaap_PaymentsToAcquireProductiveAssets (8.6)us-gaap_PaymentsToAcquireProductiveAssets
Business combinations, net of cash acquired (98.7)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (94.4)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (53.1)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Internally developed software and other costs (8.4)us-gaap_PaymentsToAcquireIntangibleAssets (9.4)us-gaap_PaymentsToAcquireIntangibleAssets (8.5)us-gaap_PaymentsToAcquireIntangibleAssets
Purchase of short-term investments (5.0)us-gaap_PaymentsToAcquireShortTermInvestments (7.0)us-gaap_PaymentsToAcquireShortTermInvestments (5.0)us-gaap_PaymentsToAcquireShortTermInvestments
Sale of short-term investments 6.6us-gaap_ProceedsFromSaleOfShortTermInvestments 5.7us-gaap_ProceedsFromSaleOfShortTermInvestments 4.9us-gaap_ProceedsFromSaleOfShortTermInvestments
Net cash provided by/(used in) investing activities (119.0)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (116.1)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (70.3)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities      
Proceeds from revolving credit facility 53.0us-gaap_ProceedsFromLinesOfCredit 145.0us-gaap_ProceedsFromLinesOfCredit 18.0us-gaap_ProceedsFromLinesOfCredit
Repayments of revolving credit facility (56.0)us-gaap_RepaymentsOfLinesOfCredit (23.0)us-gaap_RepaymentsOfLinesOfCredit (18.0)us-gaap_RepaymentsOfLinesOfCredit
Repayment of term loans (1.7)us-gaap_RepaymentsOfSeniorDebt (0.2)us-gaap_RepaymentsOfSeniorDebt 0us-gaap_RepaymentsOfSeniorDebt
Refinancing costs (0.1)us-gaap_PaymentsOfDebtIssuanceCosts (0.9)us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefit from stock based payment arrangements 0.4us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3.8us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 2.2us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Dividend paid (13.4)us-gaap_PaymentsOfDividends (12.0)us-gaap_PaymentsOfDividends (46.7)us-gaap_PaymentsOfDividends
Issue of treasury stock 0.4us-gaap_ProceedsFromStockOptionsExercised 3.8us-gaap_ProceedsFromStockOptionsExercised 1.2us-gaap_ProceedsFromStockOptionsExercised
Repurchase of common stock (6.9)us-gaap_PaymentsForRepurchaseOfCommonStock (3.7)us-gaap_PaymentsForRepurchaseOfCommonStock (1.4)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash provided by/(used in) financing activities (24.3)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 112.8us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (44.7)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of foreign currency exchange rate changes on cash (1.6)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (0.2)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (0.1)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net change in cash and cash equivalents (38.6)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 57.8us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (53.8)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 80.2us-gaap_CashAndCashEquivalentsAtCarryingValue 22.4us-gaap_CashAndCashEquivalentsAtCarryingValue 76.2us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year $ 41.6us-gaap_CashAndCashEquivalentsAtCarryingValue $ 80.2us-gaap_CashAndCashEquivalentsAtCarryingValue $ 22.4us-gaap_CashAndCashEquivalentsAtCarryingValue
[1] Amortization of deferred finance costs of $0.7 million (2013 - $0.4 million, 2012 - $0.4 million) for the year are included in depreciation and amortization in the cash flow statement but in interest expense in the income statement. Cash payments/receipts in respect of income taxes and interest are disclosed in Note 10 and Note 11, respectively, of the Notes to the Consolidated Financial Statements.