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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring and Related Activities [Abstract] |  |  |
Strategic Transaction and Integration | $ 19.8 | $ 20.5 | $ 72.2
Supplychainrestructuringcosts |  |  | 22.1
Cleanupcosts |  |  | $ 12.7

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- Definition Cleanupcosts + References No definition available. + Details
Name: | icui_Cleanupcosts
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Strategic Transaction and Integration + References No definition available. + Details
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Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Supplychainrestructuringcosts + References No definition available. + Details
Name: | icui_Supplychainrestructuringcosts
Namespace Prefix: | icui_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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