Commitments and Contingencies - Schedule of Product Warranty (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in accrued product warranty cost
Balance at the beginning of the period	$ 4.5us-gaap_StandardProductWarrantyAccrual	$ 5.1us-gaap_StandardProductWarrantyAccrual	$ 5.7us-gaap_StandardProductWarrantyAccrual
Warranty expense	10.3	1.2	2.2
Deductions and other	(3.5)	(1.8)	(2.8)
Balance at the end of the period	$ 11.3us-gaap_StandardProductWarrantyAccrual	$ 4.5us-gaap_StandardProductWarrantyAccrual	$ 5.1us-gaap_StandardProductWarrantyAccrual

Represents the aggregate decrease in the liability for accruals related to standard product warranties, which exclude warranties issued during the period. It also does not include any increase in the liability for accruals related to extended product warranties.

No definition available.

+ Details

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Namespace Prefix:	hxl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

Name:	us-gaap_StandardProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

Name:	us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration