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Pension And Postretirement Benefits (Summary Of Pension Plan Assets Valued Using Net Asset Value (NAV) Or Its Equivalent) (Details) (Pension Benefits [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Archstone Offshore Fund, Ltd [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 36,313us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_ArchstoneOffshoreFundLtdMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [1],[2] $ 35,590us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_ArchstoneOffshoreFundLtdMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency 12 Months [1] 12 Months
Unfunded Commitment None [1] None
Other Redemption Restrictions None [1] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description   90 days written [3]
Evanston Capital Management [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 30,911us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_EvanstonCapitalManagementMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [1],[2] 29,032us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_EvanstonCapitalManagementMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency 12 Months [1] 12 Months
Unfunded Commitment None [1] None
Other Redemption Restrictions None [1] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description 60 days written [3] 60 days written [3]
Strategic Value Fund [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 7,692us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_StrategicValueFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[3] 7,430us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_StrategicValueFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency 12 Months [3] 12 Months
Unfunded Commitment None [3] None
Other Redemption Restrictions None [3] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description 90 days written [3] 90 days written [3]
U.S. Equity Funds [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 100,782us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[4] 103,606us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [4] immediate
Unfunded Commitment None [4] None
Other Redemption Restrictions None [4] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
Non-U.S. Equity Funds [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 202,609us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_ForeignEquityFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[5] 220,794us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_ForeignEquityFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [5] immediate
Unfunded Commitment None [5] None
Other Redemption Restrictions None [5] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
Non-U.S. Fixed Income, Government And Corporate [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 177,548us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_ForeignFixedIncomeGovernmentAndCorporateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[6] 141,407us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_ForeignFixedIncomeGovernmentAndCorporateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [6] immediate
Unfunded Commitment None [6] None
Other Redemption Restrictions None [6] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
International Property Funds [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 53,442us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_InternationalPropertyFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[7] 38,449us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_InternationalPropertyFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [7] immediate
Unfunded Commitment None [7] None
Other Redemption Restrictions None [7] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
International Balanced Funds [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 10,127us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_InternationalBalancedFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[8] 54,724us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_InternationalBalancedFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [8] immediate
Unfunded Commitment None [8] None
Other Redemption Restrictions None [8] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
U.S. Government and Corporate Fixed Income [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 11,498us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [2],[9] 32,720us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [9] immediate
Unfunded Commitment None [9] None
Other Redemption Restrictions None [9] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
U.S. Tactical Allocation Balanced Fund [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value   15,845us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_USTacticalAllocationBalancedFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency   immediate
Unfunded Commitment   None
Other Redemption Restrictions   None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description   None [3]
U.S. Tactical Allocation Balanced Fund [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 15,972us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_UsTacticalAllocationBalancedFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [10],[2] 1,639us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_UsTacticalAllocationBalancedFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Redemption Frequency immediate [10] immediate
Unfunded Commitment None [10] None
Other Redemption Restrictions None [10] None
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Description None [3] None [3]
Non-US Tactical/Alternative Fund [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 15,391us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_NonUSTacticalAlternativeFundMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [10],[2]  
Commodities Fund [Member] [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 1,406us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cr_CommoditiesFundMemberMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 [10],[2]  
[1] These funds are alternative assets which seeks to outperform equities while maintaining a lower risk profile than equities.
[2] The fair values of the investments have been estimated using the net asset value of the investment
[3] This fund is an alternative investment that invests in distressed debt instruments seeking price appreciation.
[4] These funds invest in U.S. equity securities and seeks to meet or exceed relative benchmarks
[5] These funds invest in equity securities outside the U.S. and seek to meet or exceed relative benchmarks.
[6] These funds invest in Corporate and Governments fixed income securities outside the U.S. and seek to meet or exceed relative benchmarks.
[7] These funds invest in real property outside the U.S.
[8] These funds invest in a pre defined mix of non-U.S. equity and non-U.S. fixed income securities and seek to meet or exceed the performance of a passive/local benchmark of similar mixes.
[9] These funds invest in U.S. fixed income securities, corporate, government and agency, and seek to outperform the Barclays Capital Aggregate Index.
[10] These funds invest in a blend of equities, fixed income, cash and property in the U.S. and seek to outperform a similarly weighted index.