Acquisitions (Narrative) (Detail) (MEI Conlux Holdings [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Jul. 31, 2013
MEI Conlux Holdings [Member]
Business Acquisition [Line Items]
BusinessAcquisitionCostOfAcquiredEntityOriginalPurchasePrice	$ 820
Business acquisition, purchase price		804
MaximumShareofRefinancingCosts		5
Sales reported by acquired entity	$ 400

The original agreed upon cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

No definition available.

+ Details

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Namespace Prefix:	cr_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum share in any refinancing costs incurred as a result of the delayed closing,

+ References

No definition available.

+ Details

Name:	cr_MaximumShareofRefinancingCosts
Namespace Prefix:	cr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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Period Type:	duration

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration