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Long-Term Debt And Notes Payable (Components Of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total Long-term debt $ 749,213us-gaap_LongTermDebtNoncurrent $ 749,170us-gaap_LongTermDebtNoncurrent
Short-term borrowings 100,806us-gaap_ShortTermBorrowings 125,826us-gaap_ShortTermBorrowings
2.75% Notes Due 2018 [Member]    
Debt Instrument [Line Items]    
Total Long-term debt 249,973us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= cr_TwopointsevenfivePercentNotesDue2018Member		 249,965us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= cr_TwopointsevenfivePercentNotesDue2018Member
4.45% Notes Due 2023 [Member]    
Debt Instrument [Line Items]    
Total Long-term debt 299,978us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= cr_FourPointFourFivePercentNotesDue2023Member		 299,976us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= cr_FourPointFourFivePercentNotesDue2023Member
6.55% Notes Due 2036 [Member]    
Debt Instrument [Line Items]    
Total Long-term debt $ 199,262us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= cr_SixPointFiveFivePercentNotesDue2036Member		 $ 199,229us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= cr_SixPointFiveFivePercentNotesDue2036Member