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Commitments and Contingencies (Schedule Of Settlement And Defense Costs) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |
Pre-tax cash payments, net | $ 7.5 | $ 10.8 |
Asbestos Commitments and Contingencies |  |  |
Loss Contingencies [Line Items] |  |  |
Settlement / indemnity costs incurred | 10.5 | 5.5 | $ 40.6
Defense costs incurred | 2.5 | 3.6 | 14.6
Total costs incurred | 13.0 | 9.1 | 55.2
Settlement / indemnity payments | 9.6 | 10.1 | 42.6
Defense payments | 2.1 | 3.2 | 15.4
Insurance receipts | (4.2) | (2.5) | (13.1)
Pre-tax cash payments, net | $ 7.5 | $ 10.8 | $ 44.9

X
- Definition Costs incurred for asbestos-related defense and related fees costs before insurance recoveries and tax effects. + References No definition available. + Details
Name: | cr_DefenseCostsIncurred
Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gross settlement and defense costs incurred (before insurance recoveries and tax effects). + References No definition available. + Details
Name: | cr_GrossSettlementAndDefenseIncurredCosts
Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The insurance receipts in the period which reduce the recorded asbestos receivable pertaining to the asbestos liability. + References No definition available. + Details
Name: | cr_InsuranceInflow
Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The payments made for defense and related fees in the period which reduced the asbestos liability. + References No definition available. + Details
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Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The settlement or indemnity payments made in the period which reduced the asbestos liability. + References No definition available. + Details
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Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition (Payments) or receipts for asbestos-related fees and costs, net of insurance recoveries. + References No definition available. + Details
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Namespace Prefix: | cr_
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X
- Definition Costs incurred for asbestos-related settlement and indemnity costs before insurance recoveries and tax effects. + References No definition available. + Details
Name: | cr_SettlementIndemnityCostsIncurred
Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |