SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information
Net sales	$ 551,138	$ 437,280	$ 1,002,608	$ 770,326
Operating income/(loss)	80,982	51,601	120,923	85,392
Total assets	1,751,540		1,751,540		$ 1,575,165
Corporate And Eliminations
Segment Reporting Information
Net sales	(36,500)	(26,900)	(65,000)	(44,000)
Operating income/(loss)	(17,400)	(17,500)	(37,800)	(31,900)
Total assets	46,200		46,200		44,200
Water Systems | Operating Segments
Segment Reporting Information
Net sales	310,500	247,200	583,100	444,800
Operating income/(loss)	49,000	34,600	82,200	65,900
Total assets	1,019,300		1,019,300		894,400
Water Systems | United States & Canada
Segment Reporting Information
Net sales	158,400	114,100	293,100	198,300
Water Systems | United States & Canada | Intersegment Sales
Segment Reporting Information
Net sales	36,500	26,900	65,000	44,000
Water Systems | Latin America
Segment Reporting Information
Net sales	41,700	34,700	79,600	66,400
Water Systems | EMEA
Segment Reporting Information
Net sales	49,700	51,400	100,700	95,800
Water Systems | Asia Pacific
Segment Reporting Information
Net sales	24,200	20,100	44,700	40,300
Distribution | Operating Segments
Segment Reporting Information
Net sales	191,100	144,800	326,000	240,500
Operating income/(loss)	23,300	16,000	32,700	18,000
Total assets	407,200		407,200		363,000
Distribution | United States & Canada
Segment Reporting Information
Net sales	191,100	144,800	326,000	240,500
Distribution | United States & Canada | Intersegment Sales
Segment Reporting Information
Net sales	0	0	0	0
Fueling Systems | Operating Segments
Segment Reporting Information
Net sales	86,000	72,200	158,500	129,000
Operating income/(loss)	26,100	18,500	43,800	33,400
Total assets	278,800		278,800		$ 273,600
Fueling Systems | Intersegment Sales
Segment Reporting Information
Net sales	0	0	0	0
Fueling Systems | United States & Canada
Segment Reporting Information
Net sales	64,200	50,600	116,000	88,100
Fueling Systems | All Other
Segment Reporting Information
Net sales	$ 21,800	$ 21,600	$ 42,500	$ 40,900