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Revenue - Significant Changes in Contract Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Contract With Customer, Asset (Liability) [Roll Forward] |  |
Beginning balance | $ (1.1) | $ (0.9)
Payments received / amounts billed | (0.9) | (3.8)
Costs incurred / revenue recognized | 1.5 | 3.6
Ending balance | $ (0.5) | $ (1.1)

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- Definition Contract With Customer, Liability, Costs Incurred And Revenue Recognized + References No definition available. + Details
Name: | lxfr_ContractWithCustomerLiabilityCostsIncurredAndRevenueRecognized
Namespace Prefix: | lxfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Increase From Payments Received And Amounts Billed Over Costs Incurred + References No definition available. + Details
Name: | lxfr_ContractWithCustomerLiabilityIncreaseFromPaymentsReceivedAndAmountsBilledOverCostsIncurred
Namespace Prefix: | lxfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with Customer, Liability [Roll Forward] + References No definition available. + Details
Name: | lxfr_ContractWithCustomerLiabilityRollForward
Namespace Prefix: | lxfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant