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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting payout cap   100.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPotentialCap    
Period of time to measure Company total shareholder return and apply vesting payout cap   3 years    
Weighted-average fair value of options granted during period $ 15.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 12.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 12.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Fair value of shares vested $ 7,300,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 $ 9,600,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 $ 9,100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1  
Total intrinsic value of options exercised 14,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 25,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 26,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Cash received from options exercised   8,186,000us-gaap_ProceedsFromStockOptionsExercised 24,922,000us-gaap_ProceedsFromStockOptionsExercised 13,056,000us-gaap_ProceedsFromStockOptionsExercised
Tax benefit/(shortfall) realized for tax deductions from option exercises and vesting of restricted stock 3,600,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 7,701,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 6,353,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3,603,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Aggregate intrinsic value of exercisable options   12,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue 26,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue 15,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
Restricted Stock And Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense recognized for restricted stock awards   10,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember		 11,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember		 8,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember
Restricted Stock And Restricted Stock Units [Member] | Options Exercisable After First Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   25.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterFirstYearMember		    
Restricted Stock And Restricted Stock Units [Member] | Options Exercisable After Second Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   50.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterSecondYearMember		    
Restricted Stock And Restricted Stock Units [Member] | Options Exercisable After Third Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   75.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterThirdYearMember		    
Restricted Stock And Restricted Stock Units [Member] | Options Exercisable After Fourth Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   100.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_AwardTypeAxis
= cr_RestrictedStockAndRestrictedStockUnitsMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterFourthYearMember		    
Stock Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of common stock trading days   10 days    
Cash received from options exercised $ 18,700,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember		 $ 20,500,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember		 $ 31,000,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember		  
Stock Incentive Plan [Member] | Options Exercisable After First Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   25.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterFirstYearMember		    
Stock Incentive Plan [Member] | Options Exercisable After Second Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   50.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterSecondYearMember		    
Stock Incentive Plan [Member] | Options Exercisable After Third Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   75.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterThirdYearMember		    
Stock Incentive Plan [Member] | Options Exercisable After Fourth Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   100.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterFourthYearMember		    
Stock Incentive Plan [Member] | Prior To January 29, 2007 [Member] | Options Exercisable After First Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   50.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_TitleOfIndividualAxis
= cr_OptionsGrantedPriorToJanuaryTwentyNineTwoThousandSevenMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterFirstYearMember		    
Stock Incentive Plan [Member] | Prior To January 29, 2007 [Member] | Options Exercisable After Second Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   75.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_TitleOfIndividualAxis
= cr_OptionsGrantedPriorToJanuaryTwentyNineTwoThousandSevenMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterSecondYearMember		    
Stock Incentive Plan [Member] | Prior To January 29, 2007 [Member] | Options Exercisable After Third Year [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercisable rate   100.00%cr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableRate
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_TitleOfIndividualAxis
= cr_OptionsGrantedPriorToJanuaryTwentyNineTwoThousandSevenMember
/ cr_VestingPeriodsAxis
= cr_OptionsExercisableAfterThirdYearMember		    
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting payout potential range   0.00%cr_ShareBasedCompensationArragementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPotentialRange
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting payout potential range   175.00%cr_ShareBasedCompensationArragementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPotentialRange
/ us-gaap_RangeAxis
= us-gaap_MaximumMember