Segment Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment information
Number of geographic segments		3	3
Net sales	$ 1,979.5			$ 1,809.2	$ 1,508.6
Operating income	315.0			239.6	181.1
Interest income	(0.6)				(0.2)
Interest expense	7.0			6.3	13.3
Other expense (income), net	1.0			(0.8)	1.0
INCOME BEFORE INCOME TAXES	307.6			234.1	167.0
Capital expenditures	28.1			26.7	43.8
Depreciation and amortization	39.7			45.1	46.5
Identifiable assets (at end of period)	1,930.9	$ 1,930.9	$ 1,930.9	1,855.6	1,738.2
Property, plant and equipment, net (at end of period)	196.8	196.8	196.8	200.7	212.3
Residential & commercial flow control
Segment information
Net sales	1,034.8			953.0
HVAC & gas
Segment information
Net sales	615.2			558.5
Drains & water re-use
Segment information
Net sales	200.0			183.4
Water quality
Segment information
Net sales	129.5			114.3
U.S.
Segment information
Net sales	1,301.2			1,123.9	956.5
Property, plant and equipment, net (at end of period)	119.0	119.0	119.0	116.2	118.9
Reportable segments
Segment information
Operating income	364.6			289.0	220.0
Corporate
Segment information
Operating income	(49.6)			(49.4)	(38.9)
Intersegment sales
Segment information
Net sales	107.2			158.9	99.0
Americas
Segment information
Net sales	1,390.0			1,207.2	1,025.7
Capital expenditures	16.2			17.6	31.2
Depreciation and amortization	27.4			29.8	29.7
Identifiable assets (at end of period)	1,222.8	1,222.8	1,222.8	1,133.5	1,075.1
Property, plant and equipment, net (at end of period)	124.1	124.1	124.1	121.3	122.9
Americas | Residential & commercial flow control
Segment information
Net sales	792.3			697.4
Americas | HVAC & gas
Segment information
Net sales	366.2			308.6
Americas | Drains & water re-use
Segment information
Net sales	107.7			92.8
Americas | Water quality
Segment information
Net sales	123.8			108.4
Americas | Reportable segments
Segment information
Operating income	283.9			211.0	166.3
Americas | Intersegment sales
Segment information
Net sales	11.1			9.3	8.7
Europe
Segment information
Net sales	499.1			517.4	424.9
Capital expenditures	11.2			8.5	11.4
Depreciation and amortization	10.3			12.6	14.3
Identifiable assets (at end of period)	583.5	583.5	583.5	584.8	537.2
Property, plant and equipment, net (at end of period)	68.4	68.4	68.4	74.5	83.8
Europe | Residential & commercial flow control
Segment information
Net sales	171.1			188.0
Europe | HVAC & gas
Segment information
Net sales	234.2			237.0
Europe | Drains & water re-use
Segment information
Net sales	89.4			87.8
Europe | Water quality
Segment information
Net sales	4.4			4.6
Europe | Reportable segments
Segment information
Operating income	66.7			63.6	50.2
Europe | Intersegment sales
Segment information
Net sales	24.7			29.1	18.9
APMEA
Segment information
Net sales	90.4			84.6	58.0
Capital expenditures	0.7			0.6	1.2
Depreciation and amortization	2.0			2.7	2.5
Identifiable assets (at end of period)	124.6	124.6	124.6	137.3	125.9
Property, plant and equipment, net (at end of period)	4.3	$ 4.3	$ 4.3	4.9	5.6
APMEA | Residential & commercial flow control
Segment information
Net sales	71.4			67.6
APMEA | HVAC & gas
Segment information
Net sales	14.8			12.9
APMEA | Drains & water re-use
Segment information
Net sales	2.9			2.8
APMEA | Water quality
Segment information
Net sales	1.3			1.3
APMEA | Reportable segments
Segment information
Operating income	14.0			14.4	3.5
APMEA | Intersegment sales
Segment information
Net sales	$ 71.4			$ 120.5	$ 71.4