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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	16. SUBSEQUENT EVENT On April 1, 2021, the Company acquired 100 percent of the ownership interests in Puronics, Inc. and its wholly owned subsidiaries, headquartered in Livermore, California, for approximately $28 million. Puronics is a residential and commercial water treatment products and services provider and will be included as a part of the Water Systems segment of the Company. The initial accounting for this acquisition is incomplete, and the Company has not presented separate results of operations since closing or combined pro forma financial information of the Company and the acquired interest since the beginning of 2020, as the results of operations for this acquisition is immaterial.