OPERATING SEGMENTS - Reportable segment information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
OPERATING SEGMENTS
Net sales	$ 3,695.0	$ 3,751.9
Cost of sales	2,060.2	2,128.1
Selling, general and administrative expenses	1,050.0	1,077.7
Special (gains) and charges	29.5	28.2
Operating Income (Loss)	555.3	517.9
Operating segment
OPERATING SEGMENTS
Net sales	3,652.1	3,621.5
Cost of sales	2,035.7	2,054.8
Selling, general and administrative expenses	1,039.7	1,050.4
Special (gains) and charges	29.3	28.3
Operating Income (Loss)	547.4	488.0
Currency impact
OPERATING SEGMENTS
Net sales	42.9	130.4
Operating Income (Loss)	7.9	29.9
Global Water
OPERATING SEGMENTS
Net sales	1,826.4	1,838.9
Global Water | Operating segment
OPERATING SEGMENTS
Net sales	1,800.5	1,755.0
Cost of sales	1,073.6	1,050.5
Selling, general and administrative expenses	466.9	460.9
Operating Income (Loss)	260.0	243.6
Global Pest Elimination
OPERATING SEGMENTS
Net sales	280.6	266.1
Global Pest Elimination | Operating segment
OPERATING SEGMENTS
Net sales	278.1	260.3
Cost of sales	161.7	147.5
Selling, general and administrative expenses	70.3	66.3
Operating Income (Loss)	46.1	46.5
Global Institutional and Specialty
OPERATING SEGMENTS
Net sales	1,418.0	1,480.2
Global Institutional and Specialty | Operating segment
OPERATING SEGMENTS
Net sales	1,406.5	1,446.9
Cost of sales	705.3	770.6
Selling, general and administrative expenses	402.6	418.9
Operating Income (Loss)	298.6	257.4
Global Life Sciences
OPERATING SEGMENTS
Net sales	170.0	166.7
Global Life Sciences | Operating segment
OPERATING SEGMENTS
Net sales	167.0	159.3
Cost of sales	90.4	84.6
Selling, general and administrative expenses	51.4	55.4
Operating Income (Loss)	25.2	19.3
Corporate | Operating segment
OPERATING SEGMENTS
Cost of sales	4.7	1.6
Selling, general and administrative expenses	48.5	48.9
Special (gains) and charges	29.3	28.3
Operating Income (Loss)	$ (82.5)	$ (78.8)