OPERATING SEGMENTS (Details) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 segment	Mar. 31, 2024 item	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Financial information of reportable segments
Number of operating units		8	8
Number of reportable segments | item			4
Net sales	$ 3,751.9			$ 3,571.6
Operating Income (Loss)	517.9			351.6
Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					$ 15,320.2
Operating Income (Loss)					1,992.3
Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					15,320.2
Operating Income (Loss)					1,992.3
Global Industrial
Financial information of reportable segments
Net sales	1,839.2			1,809.1
Global Institutional and Specialty
Financial information of reportable segments
Net sales	1,266.7			1,128.8
Global Healthcare and Life Sciences
Financial information of reportable segments
Net sales	379.9			379.7
Global Pest Elimination
Financial information of reportable segments
Net sales	266.1			243.4
Corporate
Financial information of reportable segments
Net sales				10.6
Operating segment
Financial information of reportable segments
Net sales	3,761.7			3,580.8
Operating Income (Loss)	519.0			352.4
Operating segment | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					15,275.4
Operating Income (Loss)					1,987.0
Operating segment | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					15,375.5
Operating Income (Loss)					2,002.2
Operating segment | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					100.1
Operating Income (Loss)					15.2
Operating segment | Global Industrial
Financial information of reportable segments
Net sales	1,841.7			1,808.2
Operating Income (Loss)	265.0			219.8
Operating segment | Global Industrial | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					7,193.1
Operating Income (Loss)					1,080.7
Operating segment | Global Industrial | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					7,640.5
Operating Income (Loss)					1,122.0
Operating segment | Global Industrial | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					40.1
Operating Income (Loss)					2.3
Operating segment | Global Industrial | Purchase Price Adjustments | Segment Changes
Financial information of reportable segments
Net sales					407.3
Operating Income (Loss)					39.0
Operating segment | Global Institutional and Specialty
Financial information of reportable segments
Net sales	1,270.3			1,131.2
Operating Income (Loss)	248.0			130.1
Operating segment | Global Institutional and Specialty | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					4,994.0
Operating Income (Loss)					823.0
Operating segment | Global Institutional and Specialty | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					5,014.6
Operating Income (Loss)					841.8
Operating segment | Global Institutional and Specialty | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					20.6
Operating Income (Loss)					3.9
Operating segment | Global Institutional and Specialty | Purchase Price Adjustments | Segment Changes
Financial information of reportable segments
Operating Income (Loss)					14.9
Operating segment | Global Healthcare and Life Sciences
Financial information of reportable segments
Net sales	382.9			386.1
Operating Income (Loss)	37.0			35.4
Operating segment | Global Healthcare and Life Sciences | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					1,576.9
Operating Income (Loss)					160.0
Operating segment | Global Healthcare and Life Sciences | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					1,607.5
Operating Income (Loss)					160.8
Operating segment | Global Healthcare and Life Sciences | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					30.6
Operating Income (Loss)					7.5
Operating segment | Global Healthcare and Life Sciences | Purchase Price Adjustments | Segment Changes
Financial information of reportable segments
Operating Income (Loss)					(6.7)
Operating segment | Global Pest Elimination
Financial information of reportable segments
Net sales	266.8			244.6
Operating Income (Loss)	48.8			44.5
Operating segment | Global Pest Elimination | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					1,070.2
Operating Income (Loss)					210.4
Operating segment | Global Pest Elimination | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					8.7
Operating Income (Loss)					1.4
Operating segment | Global Pest Elimination | Purchase Price Adjustments | Segment Changes
Financial information of reportable segments
Net sales					1,061.5
Operating Income (Loss)					209.0
Operating segment | Other | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					1,442.3
Operating Income (Loss)					255.0
Operating segment | Other | Purchase Price Adjustments | Segment Changes
Financial information of reportable segments
Net sales					(1,442.3)
Operating Income (Loss)					(255.0)
Operating segment | Corporate
Financial information of reportable segments
Operating Income (Loss)	(79.8)			(77.4)
Operating segment | Corporate | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales				10.7
Operating segment | Corporate | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					69.1
Operating Income (Loss)					(331.7)
Operating segment | Corporate | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					42.7
Operating Income (Loss)					(332.8)
Operating segment | Corporate | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					0.1
Operating Income (Loss)					0.1
Operating segment | Corporate | Purchase Price Adjustments | Segment Changes
Financial information of reportable segments
Net sales					(26.5)
Operating Income (Loss)					(1.2)
Currency impact
Financial information of reportable segments
Net sales	(9.8)			(9.2)
Operating Income (Loss)	$ (1.1)			$ (0.8)
Currency impact | Previously Reported | Valued at 2023 Management Rates
Financial information of reportable segments
Net sales					44.8
Operating Income (Loss)					5.3
Currency impact | Previously Reported | Valued at 2024 Management Rates
Financial information of reportable segments
Net sales					(55.3)
Operating Income (Loss)					(9.9)
Currency impact | Purchase Price Adjustments | Changes in Currency Rates
Financial information of reportable segments
Net sales					(100.1)
Operating Income (Loss)					$ (15.2)