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Prepaids and Other Current Assets Related Party Text (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Prepaid Expense and Other Assets, Current [Abstract] |  |  |  |
Pfizer MSA Product Costs | $ 21.7 | $ 16.2 | $ 59.3 | $ 51.9
ICU Medical MSA Revenue | $ 17.5 | $ 16.1 | $ 57.4 | $ 55.0

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- Definition ICU Medical MSA Revenue + References No definition available. + Details
Name: | icui_ICUMedicalMSARevenue
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Pfizer MSA Product Costs + References No definition available. + Details
Name: | icui_PfizerMSAProductCosts
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration