Airplane Operating Lease Period Years

No definition available.

Name:	cr_AirplaneOperatingLeasePeriodYears
Namespace Prefix:	cr_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Of Residual Value Guarantee Fair Value of Operating Lease Asset Threshold

+ References

No definition available.

+ Details

Name:	cr_FairValueOfResidualValueGuaranteeFairValueOfOperatingLeaseAssetThreshold
Namespace Prefix:	cr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

+ Details

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

- Definition

Amount of residual asset covered by residual value guarantee under operating lease. Excludes guarantee considered to be lease payments for lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981

+ Details

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

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Leases - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Airplane operating lease period	7 years
Maximum residual value guarantee	$ 11.1
Fair value of residual value guarantee, fair value of operating lease asset, threshold	$ 14.4
Operating lease, rent expense		$ 34.8
Operating lease, rent expense			$ 33.8	$ 26.6