Defined benefit pension plan covers employees, percentage.

No definition available.

Name:	cr_DefinedBenefitPensionPlanCoversEmployeesPercentage
Namespace Prefix:	cr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Defined benefit plan amounts that will be amortized from accumulated other comprehensive income loss in next fiscal year relating to prior service cost

+ References

No definition available.

+ Details

Name:	cr_DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYearRelatingToPriorServiceCost
Namespace Prefix:	cr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of non-matching contribution to participants.

+ References

No definition available.

+ Details

Name:	cr_PercentageOfNonMatchingContributionToParticipants
Namespace Prefix:	cr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. Includes, but is not limited to, range of expected contributions, required minimum contributions and whether expected contributions are discretionary or noncash.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedAmortizationNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cr_AlternativeAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=cr_SavingsAndInvestmentPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=cr_A3NonMatchingContributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_DomesticPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Pension And Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Percentage of non-matching contribution to participants	3.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net gain/loss that will be amortized from accumulated other comprehensive income into net periodic benefit cost	$ 15.2
Estimated prior service cost that will be amortized from accumulated other compreshensive income into net periodic benefit cost,	$ 0.4
Expected cash contribution in the next fiscal year based on current actuarial calculations	3.1
Defined benefit plans contribution by the company	$ 57.5	$ 12.7
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	39.00%	47.00%
Equity securities [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	24.00%
Equity securities [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	55.00%
Equity securities [Member] \| Minimum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	25.00%
Equity securities [Member] \| Maximum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	75.00%
Fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	24.00%	23.00%
Fixed income securities [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	34.00%
Fixed income securities [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	14.00%
Fixed income securities [Member] \| Minimum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	15.00%
Fixed income securities [Member] \| Maximum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	35.00%
Alternative assets/Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	32.00%	29.00%
Alternative assets/Other [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	41.00%
Alternative assets/Other [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	22.00%
Alternative assets/Other [Member] \| Minimum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	10.00%
Alternative assets/Other [Member] \| Maximum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	35.00%
Money market [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	5.00%	1.00%
Cash [Member] \| Minimum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	0.00%
Cash [Member] \| Maximum [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	10.00%
Cash and cash equivalents [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	1.00%
Cash and cash equivalents [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	9.00%
Common Stock [Member] \| Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation, percentage	5.00%	6.00%
Savings And Investment Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans contribution by the company	$ 9.9	$ 8.5	$ 8.0
2% Non-Matching Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans contribution by the company	$ 12.5	$ 11.0	$ 10.7
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan employees, percentage	9.00%
Foreign Plan [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	6.49%	6.45%	6.77%
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan employees, percentage	20.00%
Domestic Plan [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on assets assumption reflected as a long-term asset allocation	7.75%	7.75%	7.75%