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Acquisitions (Narrative) (Detail) (USD $)
3 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 11, 2013
Business Acquisition [Line Items]            
Goodwill $ 1,174,000,000us-gaap_Goodwill   $ 1,249,316,000us-gaap_Goodwill   $ 1,191,300,000us-gaap_Goodwill  
Business Combination, Integration Related Costs 1,600,000us-gaap_BusinessCombinationIntegrationRelatedCosts 4,700,000us-gaap_BusinessCombinationIntegrationRelatedCosts        
Inventory and Backlog Amortization   4,800,000cr_InventoryandBacklogAmortization        
Restructuring charges 500,000us-gaap_RestructuringCharges 10,000,000us-gaap_RestructuringCharges        
MEI Conlux Holdings [Member]            
Business Acquisition [Line Items]            
Business Combination, Consideration Transferred     804,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= cr_MeiConluxHoldingsMember
     
Sales reported by acquired entity       399,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= cr_MeiConluxHoldingsMember
   
Two Point Seven Five Percent Notes Due 2018 [Member]            
Business Acquisition [Line Items]            
Notes Issued     250,000,000us-gaap_NotesIssued1
/ us-gaap_DebtInstrumentAxis
= cr_TwopointsevenfivePercentNotesDue2018Member
     
Debt Instrument, Interest Rate, Stated Percentage 2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cr_TwopointsevenfivePercentNotesDue2018Member
      2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cr_TwopointsevenfivePercentNotesDue2018Member
2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cr_TwopointsevenfivePercentNotesDue2018Member
Four Point Four Five Percent Notes Due 2023 [Member]            
Business Acquisition [Line Items]            
Notes Issued     300,000,000us-gaap_NotesIssued1
/ us-gaap_DebtInstrumentAxis
= cr_FourPointFourFivePercentNotesDue2023Member
     
Debt Instrument, Interest Rate, Stated Percentage           4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cr_FourPointFourFivePercentNotesDue2023Member
Acquisition Related Restructuring [Member]            
Business Acquisition [Line Items]            
Restructuring charges         10,300,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= cr_AcquisitionRelatedRestructuringMember
 
Acquisition Related Restructuring [Member]            
Business Acquisition [Line Items]            
Restructuring charges $ 200,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= cr_AcquisitionRelatedRestructuringMember
$ 4,000,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= cr_AcquisitionRelatedRestructuringMember