OPERATING SEGMENTS (Details) $ in Millions	3 Months Ended		6 Months Ended				12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 segment	Jun. 30, 2020 item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Financial information of reportable segments
Number of reportable segments				3	3
Net sales	$ 2,685.7	$ 3,169.1	$ 5,706.3			$ 6,093.8	$ 12,562.0
Operating Income (Loss)	192.0	464.4	568.2			778.0	1,845.2
Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							14,906.3
Operating Income (Loss)							2,013.8
Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							14,906.3
Operating Income (Loss)							2,013.8
Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Net sales							(2,344.3)
Operating Income (Loss)							(168.6)
Global Industrial
Financial information of reportable segments
Net sales	1,425.2	1,501.0	2,859.2			2,902.2
Global Institutional
Financial information of reportable segments
Net sales	708.1	1,110.4	1,775.1			2,131.2
Global Healthcare and Life Sciences
Financial information of reportable segments
Net sales	298.5	251.9	542.3			479.4
Other
Financial information of reportable segments
Net sales	241.6	305.8	517.4			581.0
Operating segment
Financial information of reportable segments
Net sales	2,765.0	3,172.2	5,804.8			6,091.1	12,597.4
Operating Income (Loss)	206.2	465.6	585.1			778.9	1,854.3
Operating segment | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							15,046.9
Operating Income (Loss)							2,034.2
Operating segment | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							14,952.1
Operating Income (Loss)							2,023.6
Operating segment | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							(94.8)
Operating Income (Loss)							(10.6)
Operating segment | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Net sales							(2,354.7)
Operating Income (Loss)							(169.3)
Operating segment | Global Industrial
Financial information of reportable segments
Net sales	1,475.6	1,500.7	2,919.2			2,897.7	5,994.6
Operating Income (Loss)	283.0	220.9	489.6			382.3	902.7
Operating segment | Global Industrial | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							5,569.9
Operating Income (Loss)							854.7
Operating segment | Global Industrial | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							5,996.4
Operating Income (Loss)							980.6
Operating segment | Global Industrial | Adjustment | Segment Change
Financial information of reportable segments
Net sales							479.2
Operating Income (Loss)							133.4
Operating segment | Global Industrial | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							(52.7)
Operating Income (Loss)							(7.5)
Operating segment | Global Industrial | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Net sales							(1.8)
Operating Income (Loss)							(77.9)
Operating segment | Global Institutional
Financial information of reportable segments
Net sales	722.4	1,112.5	1,794.5			2,132.7	4,412.1
Operating Income (Loss)	(37.0)	234.4	145.4			409.2	939.8
Operating segment | Global Institutional | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							5,235.5
Operating Income (Loss)							1,042.2
Operating segment | Global Institutional | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							4,412.1
Operating Income (Loss)							947.3
Operating segment | Global Institutional | Adjustment | Segment Change
Financial information of reportable segments
Net sales							(800.1)
Operating Income (Loss)							(93.4)
Operating segment | Global Institutional | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							(23.3)
Operating Income (Loss)							(1.5)
Operating segment | Global Institutional | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Operating Income (Loss)							(7.5)
Operating segment | Global Healthcare and Life Sciences
Financial information of reportable segments
Net sales	307.6	252.8	554.1			479.8	979.0
Operating Income (Loss)	65.6	31.2	88.5			56.0	124.5
Operating segment | Global Healthcare and Life Sciences | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							979.0
Operating Income (Loss)							135.1
Operating segment | Global Healthcare and Life Sciences | Adjustment | Segment Change
Financial information of reportable segments
Net sales							991.7
Operating Income (Loss)							136.7
Operating segment | Global Healthcare and Life Sciences | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							(12.7)
Operating Income (Loss)							(1.6)
Operating segment | Global Healthcare and Life Sciences | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Operating Income (Loss)							(10.6)
Operating segment | Upstream Energy | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							2,352.9
Operating Income (Loss)							187.9
Operating segment | Upstream Energy | Adjustment | Segment Change
Financial information of reportable segments
Net sales							2,350.0
Operating Income (Loss)							188.2
Operating segment | Upstream Energy | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							2.9
Operating Income (Loss)							(0.3)
Operating segment | Upstream Energy | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Net sales							(2,352.9)
Operating Income (Loss)							(187.9)
Operating segment | Global Energy | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							3,334.0
Operating Income (Loss)							379.1
Operating segment | Global Energy | Adjustment | Segment Change
Financial information of reportable segments
Net sales							(3,334.0)
Operating Income (Loss)							(379.1)
Operating segment | Other
Financial information of reportable segments
Net sales	247.1	306.2	524.7			580.9	1,211.7
Operating Income (Loss)	21.3	41.8	42.9			67.5	167.0
Operating segment | Other | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							907.5
Operating Income (Loss)							167.3
Operating segment | Other | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							1,211.7
Operating Income (Loss)							180.6
Operating segment | Other | Adjustment | Segment Change
Financial information of reportable segments
Net sales							313.2
Operating Income (Loss)							14.2
Operating segment | Other | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							(9.0)
Operating Income (Loss)							(0.9)
Operating segment | Other | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Operating Income (Loss)							(13.6)
Currency Impact
Financial information of reportable segments
Net sales	(79.3)	(3.1)	(98.5)			2.7	(35.4)
Operating Income (Loss)	(14.2)	(1.2)	(16.9)			(0.9)	(9.1)
Currency Impact | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Net sales							(140.6)
Operating Income (Loss)							(20.4)
Currency Impact | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Net sales							(45.8)
Operating Income (Loss)							(9.8)
Currency Impact | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Net sales							94.8
Operating Income (Loss)							10.6
Currency Impact | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Net sales							10.4
Operating Income (Loss)							0.7
Corporate
Financial information of reportable segments
Net sales	12.3		12.3
Operating Income (Loss)	$ (126.7)	$ (62.7)	$ (181.3)			$ (136.1)	(279.7)
Corporate | Previously Reported | Valued at 2019 Management Rates
Financial information of reportable segments
Operating Income (Loss)							(409.1)
Corporate | Previously Reported | Valued at 2020 Management Rates
Financial information of reportable segments
Operating Income (Loss)							(407.9)
Corporate | Adjustment | Fixed Currency Rate Change
Financial information of reportable segments
Operating Income (Loss)							1.2
Corporate | Adjustment | Discontinued Operations and Related Allocation Charges
Financial information of reportable segments
Operating Income (Loss)							$ 128.2