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Commitments And Contingencies (Schedule Of Gross Settlement And Defense Costs) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Loss Contingencies [Line Items] |  |  |  |  |  |
Pre-tax cash payments | $ 77,957,000 |  | $ 79,277,000 |  | $ 66,731,000 |
Asbestos Commitments And Contingencies [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement / indemnity costs incurred | 37,500,000 | [1] | 50,200,000 | [1] | 52,700,000 | [1]
Defense costs incurred | 58,700,000 | [1] | 55,300,000 | [1] | 53,900,000 | [1]
Total costs incurred | 96,100,000 |  | 105,500,000 |  | 106,600,000 |
Settlement / indemnity payments | 38,000,000 |  | 55,000,000 |  | 46,900,000 |
Defense payments | 59,800,000 |  | 56,500,000 |  | 54,400,000 |
Insurance Receipts | (19,800,000) |  | (32,200,000) |  | (34,600,000) |
Pre-tax cash payments | $ 78,000,000 |  | $ 79,300,000 |  | $ 66,700,000 |
[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
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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
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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_
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Balance Type: | credit
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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
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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
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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

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- Details
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