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Retirement Plans - Pension Plans Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2015
Sep. 17, 2013
Defined Benefit Plan Disclosure [Line Items]              
Total pension expense $ 0.2us-gaap_PensionExpense $ 2.6us-gaap_PensionExpense $ 2.0us-gaap_PensionExpense        
Settlement of UK pension plan, credit to income taxes 0us-gaap_IncomeTaxReconciliationTaxSettlementsForeign (2.3)us-gaap_IncomeTaxReconciliationTaxSettlementsForeign 0us-gaap_IncomeTaxReconciliationTaxSettlementsForeign        
Settlement of UK pension plan 0.5us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions 10.6us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions 0us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions        
Increase in projected benefit liability 2.3us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease            
Pension Plans, Defined Benefit [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions in current fiscal year 2.1us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
           
United States              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions in current fiscal year 1.4us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
         
Minimum service years to be entitled to pension benefits 3 years            
Pay credits as a percentage of each participant's eligible earnings       0.03imn_DefinedBenefitPlanPayCreditsAsPercentageOfEachParticipantsEligibleEarnings
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0.06imn_DefinedBenefitPlanPayCreditsAsPercentageOfEachParticipantsEligibleEarnings
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
   
Interest credit rate in current year 0.0380imn_DefinedBenefitPlanInterestCreditRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
           
Interest credit rate in next fiscal year 0.0304imn_DefinedBenefitPlanInterestCreditRateForNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
           
Pension settlement loss 1.1us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2.1us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
2.4us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
       
Noncurrent assets 0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
         
International              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions in current fiscal year 0.7us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
1.5us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
         
Noncurrent assets 1.6us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
         
Minimum | Pension Plans, Defined Benefit [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Estimated future employer contributions in next fiscal year 1us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Maximum | Pension Plans, Defined Benefit [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Estimated future employer contributions in next fiscal year 2us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
United Kingdom | International              
Defined Benefit Plan Disclosure [Line Items]              
Pension settlement loss   10.6us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= country_GB
         
Settlement of UK pension plan, credit to income taxes   2.3us-gaap_IncomeTaxReconciliationTaxSettlementsForeign
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= country_GB
         
Noncurrent assets             6.4us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_StatementGeographicalAxis
= country_GB
Restructuring and other | United Kingdom | International              
Defined Benefit Plan Disclosure [Line Items]              
Settlement of UK pension plan 0.5us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_IncomeStatementLocationAxis
= imn_RestructuringAndOtherExpensesMember
/ us-gaap_StatementGeographicalAxis
= country_GB
           
Scenario, Forecast              
Defined Benefit Plan Disclosure [Line Items]              
Expected increase in pension expense           $ 0.3imn_IncreaseDecreaseinPensionExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember