OPERATING SEGMENTS - Reportable segment information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
OPERATING SEGMENTS
Net sales	$ 4,025.2	$ 3,985.8	$ 7,720.2	$ 7,737.7
Cost of sales	2,222.8	2,241.0	4,283.0	4,369.1
Selling, general and administrative expenses	1,067.7	1,075.7	2,117.7	2,153.4
Special (gains) and charges	24.6	12.2	54.1	40.4
Operating Income (Loss)	710.1	656.9	1,265.4	1,174.8
Operating segment
OPERATING SEGMENTS
Net sales	3,908.2	3,871.3	7,560.3	7,492.8
Cost of sales	2,156.8	2,172.8	4,192.5	4,227.6
Selling, general and administrative expenses	1,040.6	1,053.1	2,080.3	2,103.5
Special (gains) and charges	24.1	12.2	53.4	40.5
Operating Income (Loss)	686.7	633.2	1,234.1	1,121.2
Currency impact
OPERATING SEGMENTS
Net sales	117.0	114.5	159.9	244.9
Operating Income (Loss)	23.4	23.7	31.3	53.6
Global Water
OPERATING SEGMENTS
Net sales	1,977.3	1,936.1	3,803.7	3,775.0
Global Water | Operating segment
OPERATING SEGMENTS
Net sales	1,908.5	1,863.2	3,709.0	3,618.2
Cost of sales	1,143.5	1,109.8	2,217.1	2,160.3
Selling, general and administrative expenses	458.7	464.8	925.6	925.7
Operating Income (Loss)	306.3	288.6	566.3	532.2
Global Pest Elimination
OPERATING SEGMENTS
Net sales	317.4	295.7	598.0	561.8
Global Pest Elimination | Operating segment
OPERATING SEGMENTS
Net sales	311.3	290.2	589.4	550.5
Cost of sales	176.1	160.3	337.8	307.8
Selling, general and administrative expenses	74.0	69.9	144.3	136.2
Operating Income (Loss)	61.2	60.0	107.3	106.5
Global Institutional and Specialty
OPERATING SEGMENTS
Net sales	1,544.6	1,577.8	2,962.6	3,058.0
Global Institutional and Specialty | Operating segment
OPERATING SEGMENTS
Net sales	1,511.7	1,548.1	2,918.2	2,995.0
Cost of sales	741.7	803.5	1,447.0	1,574.1
Selling, general and administrative expenses	410.6	415.1	813.2	834.0
Operating Income (Loss)	359.4	329.5	658.0	586.9
Global Life Sciences
OPERATING SEGMENTS
Net sales	185.9	176.2	355.9	342.9
Global Life Sciences | Operating segment
OPERATING SEGMENTS
Net sales	176.7	169.8	343.7	329.1
Cost of sales	92.8	98.5	183.2	183.1
Selling, general and administrative expenses	49.1	54.3	100.5	109.7
Operating Income (Loss)	34.8	17.0	60.0	36.3
Corporate | Operating segment
OPERATING SEGMENTS
Cost of sales	2.7	0.7	7.4	2.3
Selling, general and administrative expenses	48.2	49.0	96.7	97.9
Special (gains) and charges	24.1	12.2	53.4	40.5
Operating Income (Loss)	$ (75.0)	$ (61.9)	$ (157.5)	$ (140.7)