Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 25, 2023 USD ($)	Jun. 26, 2022 USD ($)	Jun. 25, 2023 USD ($) segment	Jun. 26, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment information
Number of geographic segments | segment			3
Net sales	$ 532.8	$ 526.6	$ 1,004.5	$ 989.8
Operating income	100.4	95.9	185.1	167.4
Interest income	(1.3)		(1.7)	(0.1)
Interest expense	1.7	1.7	3.2	3.1
Other (income) expense, net	(0.6)		(0.5)	0.3
INCOME BEFORE INCOME TAXES	100.6	94.2	184.1	164.1
Capital expenditures	6.5	7.5	11.6	13.1
Depreciation and amortization	10.3	10.0	20.3	20.3
Identifiable assets (at end of period)	2,004.4	1,934.3	2,004.4	1,934.3	$ 1,930.9
Property, plant and equipment, net (at end of period)	196.3	194.0	196.3	194.0	$ 196.8
Residential & commercial flow control
Segment information
Net sales	299.2	276.7	555.1	516.7
HVAC & gas
Segment information
Net sales	154.8	162.2	298.7	308.9
Drains & water re-use
Segment information
Net sales	50.9	52.8	94.0	99.2
Water quality
Segment information
Net sales	27.9	34.9	56.7	65.0
U.S.
Segment information
Net sales	343.0	352.1	647.3	646.3
Reportable segments
Segment information
Operating income	115.6	108.7	211.3	190.7
Corporate
Segment information
Operating income	(15.2)	(12.8)	(26.2)	(23.3)
Intersegment sales
Segment information
Net sales	38.8	38.3	68.5	71.9
Americas
Segment information
Net sales	366.9	375.9	690.1	689.8
Capital expenditures	4.9	4.3	8.1	7.8
Depreciation and amortization	7.4	6.7	14.5	13.7
Identifiable assets (at end of period)	1,259.1	1,223.6	1,259.1	1,223.6
Property, plant and equipment, net (at end of period)	123.0	123.6	123.0	123.6
Americas | Residential & commercial flow control
Segment information
Net sales	227.0	211.9	421.5	389.9
Americas | HVAC & gas
Segment information
Net sales	85.3	100.7	163.5	185.0
Americas | Drains & water re-use
Segment information
Net sales	28.1	29.8	50.9	52.6
Americas | Water quality
Segment information
Net sales	26.5	33.5	54.2	62.3
Americas | U.S.
Segment information
Property, plant and equipment, net (at end of period)	118.1	118.7	118.1	118.7
Americas | Reportable segments
Segment information
Operating income	91.6	85.5	164.1	143.4
Americas | Intersegment sales
Segment information
Net sales	2.0	2.4	4.0	5.4
Europe
Segment information
Net sales	135.6	127.9	263.9	257.8
Capital expenditures	1.3	2.8	3.1	4.9
Depreciation and amortization	2.3	2.8	4.7	5.5
Identifiable assets (at end of period)	588.1	569.1	588.1	569.1
Property, plant and equipment, net (at end of period)	68.9	65.8	68.9	65.8
Europe | Residential & commercial flow control
Segment information
Net sales	47.0	46.2	92.5	92.3
Europe | HVAC & gas
Segment information
Net sales	65.2	57.9	127.5	117.9
Europe | Drains & water re-use
Segment information
Net sales	22.3	22.7	41.9	45.5
Europe | Water quality
Segment information
Net sales	1.1	1.1	2.0	2.1
Europe | Reportable segments
Segment information
Operating income	21.5	19.6	40.7	40.7
Europe | Intersegment sales
Segment information
Net sales	8.3	6.9	13.9	14.0
APMEA
Segment information
Net sales	30.3	22.8	50.5	42.2
Capital expenditures	0.3	0.4	0.4	0.4
Depreciation and amortization	0.6	0.5	1.1	1.1
Identifiable assets (at end of period)	157.2	141.6	157.2	141.6
Property, plant and equipment, net (at end of period)	4.4	4.6	4.4	4.6
APMEA | Residential & commercial flow control
Segment information
Net sales	25.2	18.6	41.1	34.5
APMEA | HVAC & gas
Segment information
Net sales	4.3	3.6	7.7	6.0
APMEA | Drains & water re-use
Segment information
Net sales	0.5	0.3	1.2	1.1
APMEA | Water quality
Segment information
Net sales	0.3	0.3	0.5	0.6
APMEA | Reportable segments
Segment information
Operating income	2.5	3.6	6.5	6.6
APMEA | Intersegment sales
Segment information
Net sales	$ 28.5	$ 29.0	$ 50.6	$ 52.5