OPERATING SEGMENTS (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Financial information of reportable segments
Number of reportable segments | item			3
Net sales	$ 3,462.7	$ 3,317.2	$ 6,624.3	$ 6,414.6	$ 13,152.8
Operating Income (Loss)	439.0	412.5	812.3	784.0	1,915.0
Previously Reported
Financial information of reportable segments
Net sales					13,152.8
Operating Income (Loss)					1,915.0
Operating segment
Financial information of reportable segments
Net sales	3,438.6	3,264.2	6,599.1	6,355.4	13,004.8
Operating Income (Loss)	435.1	405.6	807.7	773.9	1,889.8
Operating segment | Previously Reported
Financial information of reportable segments
Net sales					12,955.0
Operating Income (Loss)					1,882.8
Operating segment | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales					49.8
Operating Income (Loss)					7.0
Operating segment | Global Industrial
Financial information of reportable segments
Net sales	1,209.8	1,170.8	2,338.4	2,266.3	4,687.2
Operating Income (Loss)	167.5	174.5	294.5	306.0	720.0
Operating segment | Global Industrial | Previously Reported
Financial information of reportable segments
Net sales					4,617.1
Operating Income (Loss)					703.0
Operating segment | Global Industrial | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales					6.9
Operating Income (Loss)					(0.9)
Operating segment | Global Industrial | Adjustment | Other
Financial information of reportable segments
Net sales					63.2
Operating Income (Loss)					17.9
Operating segment | Global Institutional
Financial information of reportable segments
Net sales	1,221.1	1,128.4	2,299.2	2,165.8	4,440.1
Operating Income (Loss)	259.8	243.0	451.9	435.7	950.5
Operating segment | Global Institutional | Previously Reported
Financial information of reportable segments
Net sales					4,495.6
Operating Income (Loss)					966.7
Operating segment | Global Institutional | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales					7.7
Operating Income (Loss)					3.0
Operating segment | Global Institutional | Adjustment | Other
Financial information of reportable segments
Net sales					(63.2)
Operating Income (Loss)					(19.2)
Operating segment | Global Energy
Financial information of reportable segments
Net sales	792.4	762.8	1,549.4	1,534.4	3,075.8
Operating Income (Loss)	73.4	79.7	146.4	142.3	346.7
Operating segment | Global Energy | Previously Reported
Financial information of reportable segments
Net sales					3,035.8
Operating Income (Loss)					337.1
Operating segment | Global Energy | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales					40.0
Operating Income (Loss)					7.9
Operating segment | Global Energy | Adjustment | Other
Financial information of reportable segments
Operating Income (Loss)					1.7
Operating segment | Other
Financial information of reportable segments
Net sales	215.3	202.2	412.1	388.9	801.7
Operating Income (Loss)	37.0	38.2	66.9	67.8	145.2
Operating segment | Other | Previously Reported
Financial information of reportable segments
Net sales					806.5
Operating Income (Loss)					148.1
Operating segment | Other | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales					(4.8)
Operating Income (Loss)					(2.5)
Operating segment | Other | Adjustment | Other
Financial information of reportable segments
Operating Income (Loss)					(0.4)
Currency Impact
Financial information of reportable segments
Net sales	24.1	53.0	25.2	59.2	148.0
Operating Income (Loss)	3.9	6.9	4.6	10.1	25.2
Currency Impact | Previously Reported
Financial information of reportable segments
Net sales					197.8
Operating Income (Loss)					32.2
Currency Impact | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales					(49.8)
Operating Income (Loss)					(7.0)
Corporate
Financial information of reportable segments
Operating Income (Loss)	$ (102.6)	$ (129.8)	(152.0)	$ (177.9)	(272.6)
Corporate | Previously Reported
Financial information of reportable segments
Operating Income (Loss)					(272.1)
Corporate | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Operating Income (Loss)					$ (0.5)
Intersegment
Financial information of reportable segments
Net sales			$ 0.0