Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2022 USD ($)	Jun. 27, 2021 USD ($)	Jun. 26, 2022 USD ($)	Jun. 26, 2022 USD ($) segment	Jun. 26, 2022 USD ($) item	Jun. 27, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment information
Number of geographic segments				3	3
Net sales	$ 526.6	$ 467.0	$ 989.8			$ 880.3
Operating income	95.9	52.7	167.4			112.3
Interest income			(0.1)
Interest expense	1.7	1.5	3.1			3.5
Other (income) expense, net		(0.5)	0.3			(0.8)
INCOME BEFORE INCOME TAXES	94.2	51.7	164.1			109.6
Capital expenditures	7.5	8.3	13.1			13.0
Depreciation and amortization	10.0	11.5	20.3			23.3
Identifiable assets (at end of period)	1,934.3	1,855.3	1,934.3	$ 1,934.3	$ 1,934.3	1,855.3	$ 1,855.6
Property, plant and equipment, net (at end of period)	194.0	207.0	194.0	194.0	194.0	207.0	$ 200.7
Residential & commercial flow control
Segment information
Net sales	276.7	247.6	516.7			471.9
HVAC & gas
Segment information
Net sales	162.2	142.1	308.9			264.5
Drains & water re-use
Segment information
Net sales	52.8	48.2	99.2			87.4
Water quality
Segment information
Net sales	34.9	29.1	65.0			56.5
U.S.
Segment information
Net sales	352.1	285.0	646.3			539.4
Reportable segments
Segment information
Operating income	108.7	64.9	190.7			135.2
Corporate
Segment information
Operating income	(12.8)	(12.2)	(23.3)			(22.9)
Intersegment sales
Segment information
Net sales	38.3	48.1	71.9			84.5
Americas
Segment information
Net sales	375.9	307.1	689.8			579.9
Capital expenditures	4.3	4.8	7.8			7.2
Depreciation and amortization	6.7	7.4	13.7			15.1
Identifiable assets (at end of period)	1,223.6	1,127.2	1,223.6	1,223.6	1,223.6	1,127.2
Property, plant and equipment, net (at end of period)	123.6	120.6	123.6	123.6	123.6	120.6
Americas | Residential & commercial flow control
Segment information
Net sales	211.9	177.2	389.9			339.5
Americas | HVAC & gas
Segment information
Net sales	100.7	77.6	185.0			143.5
Americas | Drains & water re-use
Segment information
Net sales	29.8	25.2	52.6			43.8
Americas | Water quality
Segment information
Net sales	33.5	27.1	62.3			53.1
Americas | U.S.
Segment information
Property, plant and equipment, net (at end of period)	118.7	116.0	118.7	118.7	118.7	116.0
Americas | Reportable segments
Segment information
Operating income	85.5	55.2	143.4			103.7
Americas | Intersegment sales
Segment information
Net sales	2.4	2.5	5.4			4.9
Europe
Segment information
Net sales	127.9	136.8	257.8			259.7
Capital expenditures	2.8	2.9	4.9			5.2
Depreciation and amortization	2.8	3.0	5.5			6.3
Identifiable assets (at end of period)	569.1	586.7	569.1	569.1	569.1	586.7
Property, plant and equipment, net (at end of period)	65.8	81.5	65.8	65.8	65.8	81.5
Europe | Residential & commercial flow control
Segment information
Net sales	46.2	51.8	92.3			99.1
Europe | HVAC & gas
Segment information
Net sales	57.9	60.9	117.9			115.1
Europe | Drains & water re-use
Segment information
Net sales	22.7	22.5	45.5			42.7
Europe | Water quality
Segment information
Net sales	1.1	1.6	2.1			2.8
Europe | Reportable segments
Segment information
Operating income	19.6	5.4	40.7			24.9
Europe | Intersegment sales
Segment information
Net sales	6.9	8.5	14.0			16.2
APMEA
Segment information
Net sales	22.8	23.1	42.2			40.7
Capital expenditures	0.4	0.6	0.4			0.6
Depreciation and amortization	0.5	1.1	1.1			1.9
Identifiable assets (at end of period)	141.6	141.4	141.6	141.6	141.6	141.4
Property, plant and equipment, net (at end of period)	4.6	4.9	4.6	$ 4.6	$ 4.6	4.9
APMEA | Residential & commercial flow control
Segment information
Net sales	18.6	18.6	34.5			33.3
APMEA | HVAC & gas
Segment information
Net sales	3.6	3.6	6.0			5.9
APMEA | Drains & water re-use
Segment information
Net sales	0.3	0.5	1.1			0.9
APMEA | Water quality
Segment information
Net sales	0.3	0.4	0.6			0.6
APMEA | Reportable segments
Segment information
Operating income	3.6	4.3	6.6			6.6
APMEA | Intersegment sales
Segment information
Net sales	$ 29.0	$ 37.1	$ 52.5			$ 63.4