SEGMENT REPORTING (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 659.2	$ 679.8	$ 700.6	$ 690.0	$ 637.8	$ 653.8	$ 662.7	$ 644.7	$ 2,729.6	$ 2,599.0	$ 2,203.3
Operating earnings									452.3	384.0	362.9
Total assets	3,140.9				3,173.1				3,140.9	3,173.1
Goodwill	813.2				840.4				813.2	840.4	1,571.0
Capital expenditures									80.5	255.6	154.9
Depreciation and amortization									85.3	$ 142.3	89.6
Term of transition services maximum										24 months
UNITED KINGDOM
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									749.5	$ 734.7
PHILIPPINES
Segment Reporting, Revenue Reconciling Item [Line Items]
Total assets	527.6				350.7				527.6	350.7
Commercial Aircraft
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									2,098.3	2,058.9	1,784.7
Operating earnings excluding KLX corporate allocations									367.5	356.3	320.3
Total assets	2,120.5				2,129.5				2,120.5	2,129.5	1,977.3
Goodwill	372.6				379.8				372.6	379.8	394.6
Capital expenditures									61.7
Depreciation and amortization									63.1
Commercial Aircraft | Continuing Operations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Capital expenditures										102.8	96.5
Depreciation and amortization										63.4	50.4
Consumables Management
Segment Reporting, Revenue Reconciling Item [Line Items]
Goodwill											1,086.5
Business Jet
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									631.3	540.1	418.6
Operating earnings excluding KLX corporate allocations									84.8	50.0	69.0
Total assets	1,020.4				1,043.6				1,020.4	1,043.6	458.2
Goodwill	440.6				460.6				440.6	460.6	89.9
Capital expenditures									18.8
Depreciation and amortization									22.2
Business Jet | Continuing Operations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Capital expenditures										28.8	17.8
Depreciation and amortization										17.4	9.4
Corporation [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									2,729.6	2,599.0	2,203.3
Operating earnings excluding KLX corporate allocations									452.3	406.3	389.3
KLX corporate allocations										(22.3)	(26.4)
Operating earnings										384.0	362.9
Total assets	3,140.9				3,173.1				3,140.9	3,173.1	2,435.5
Goodwill	$ 813.2				$ 840.4				813.2	840.4	484.5
Capital expenditures									80.5	255.6	154.9
Depreciation and amortization									$ 85.3	142.3	89.6
Corporation [Member] | Continuing Operations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Capital expenditures										131.6	114.3
Depreciation and amortization										80.8	59.8
Corporation [Member] | Discontinued Operations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Capital expenditures										124.0	40.6
Depreciation and amortization										$ 61.5	$ 29.8