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Restructuring, Strategic Transaction and Integration Strategic Transaction and Integration Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Restructuring and Related Activities [Abstract] |  |  |
Strategic Transaction and Integration | $ 61.7 | $ 19.8 | $ 20.5

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- Definition Strategic Transaction and Integration + References No definition available. + Details
Name: | icui_StrategicTransactionandIntegration
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_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration