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Commitments And Contingencies (Schedule Of Settlement And Defense Costs) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Loss Contingencies [Line Items] |  |  |  |  |  |
Pre-tax cash payments | $ 10,493,000 |  | $ 18,235,000 |  |  |
Asbestos Commitments and Contingencies |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement / indemnity costs incurred (1) | 6,800,000 | [1] | 10,400,000 | [1] | 37,500,000 | [1]
Defense costs incurred (1) | 13,700,000 | [1] | 13,100,000 | [1] | 58,700,000 | [1]
Total costs incurred | 20,500,000 |  | 23,600,000 |  | 96,100,000 |
Settlement / indemnity payments | 9,600,000 |  | 9,400,000 |  | 38,000,000 |
Payments For Asbestos Related Defense And Related Fees Costs | 13,000,000 |  | 12,900,000 |  | 59,800,000 |
Insurance receipts | 12,100,000 |  | 4,000,000 |  | 19,800,000 |
Pre-tax cash payments | $ 10,500,000 |  | $ 18,200,000 |  | $ 78,000,000 |
[1] | Before insurance recoveries and tax effects.

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- 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
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Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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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

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- 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_
Data Type: | xbrli:monetaryItemType
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- 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
- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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