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Fair Value Measurements (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of our revolving facility and senior debt $ 944.7us-gaap_DebtInstrumentFairValue
Carrying value of our revolving facility and senior debt $ 906.3iex_LongTermDebtCarryingValue
2.58% Senior Euro Notes, due June 2015  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Stated interest rate 2.58%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_InvestmentTypeAxis
= iex_SeniorEuroNotesMember
4.5% Senior Notes, due December 2020  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Stated interest rate 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_InvestmentTypeAxis
= iex_FourPointFivePercentageSeniorNotesMember
4.2% Senior Notes, due December 2021  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Stated interest rate 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_InvestmentTypeAxis
= iex_FourPointTwoPercentageSeniorNotesMember