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Pension And Other Postretirement Benefit Plans (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012
Pension Plans, Defined Benefit |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plans contribution by the company | $ 15 |
Defined benefit plans contribution by the company | 2.7 | 4.0
Other Postretirement Benefit Plans, Defined Benefit |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plans contribution by the company | 1 |
Defined benefit plans contribution by the company | $ 0.1 | $ 1.0

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- Definition The total estimated amount of benefits expected to be paid in the current fiscal year, comprised of amounts contributed in the current fiscal year as well as expected future payments in the current fiscal year. + References No definition available. + Details
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Namespace Prefix: | cr_
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Balance Type: | debit
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
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