Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2023 USD ($)	Sep. 25, 2022 USD ($)	Sep. 24, 2023 USD ($) segment	Sep. 25, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment information
Number of geographic segments | segment			3
Net sales	$ 504.3	$ 487.8	$ 1,508.8	$ 1,477.6
Operating income	87.1	80.4	272.2	247.8
Interest income	(2.3)	(0.2)	(4.0)	(0.3)
Interest expense	1.2	1.9	4.4	5.0
Other (income) expense, net	0.1	(0.1)	(0.4)	0.2
INCOME BEFORE INCOME TAXES	88.1	78.8	272.2	242.9
Capital expenditures	7.4	7.1	19.0	20.2
Depreciation and amortization	10.5	10.2	30.8	30.6
Identifiable assets (at end of period)	2,017.6	1,885.6	2,017.6	1,885.6	$ 1,930.9
Property, plant and equipment, net (at end of period)	194.0	189.1	194.0	189.1	$ 196.8
Residential & commercial flow control
Segment information
Net sales	280.0	252.0	835.3	768.7
HVAC & gas
Segment information
Net sales	146.6	149.4	445.2	458.3
Drains & water re-use
Segment information
Net sales	49.4	52.5	143.4	151.8
Water quality
Segment information
Net sales	28.3	33.9	84.9	98.8
U.S.
Segment information
Net sales	328.7	327.1	976.0	973.5
Reportable segments
Segment information
Operating income	103.6	92.9	314.9	283.6
Corporate
Segment information
Operating income	(16.5)	(12.5)	(42.7)	(35.8)
Intersegment sales
Segment information
Net sales	24.2	19.5	92.8	91.3
Americas
Segment information
Net sales	351.0	349.8	1,041.1	1,039.6
Capital expenditures	5.4	3.2	13.5	11.0
Depreciation and amortization	7.5	7.3	22.0	21.0
Identifiable assets (at end of period)	1,292.2	1,220.8	1,292.2	1,220.8
Property, plant and equipment, net (at end of period)	123.5	122.0	123.5	122.0
Americas | Residential & commercial flow control
Segment information
Net sales	212.9	196.0	634.4	586.0
Americas | HVAC & gas
Segment information
Net sales	82.8	91.3	246.3	276.3
Americas | Drains & water re-use
Segment information
Net sales	28.0	30.0	78.9	82.6
Americas | Water quality
Segment information
Net sales	27.3	32.5	81.5	94.7
Americas | U.S.
Segment information
Property, plant and equipment, net (at end of period)	118.5	117.1	118.5	117.1
Americas | Reportable segments
Segment information
Operating income	85.7	76.2	249.8	219.6
Americas | Intersegment sales
Segment information
Net sales	1.4	2.5	5.5	7.9
Europe
Segment information
Net sales	120.2	113.1	384.1	370.9
Capital expenditures	1.7	3.8	4.8	8.7
Depreciation and amortization	2.4	2.4	7.1	8.0
Identifiable assets (at end of period)	571.0	539.7	571.0	539.7
Property, plant and equipment, net (at end of period)	66.3	62.9	66.3	62.9
Europe | Residential & commercial flow control
Segment information
Net sales	38.6	36.8	131.2	129.1
Europe | HVAC & gas
Segment information
Net sales	60.0	53.7	187.4	171.6
Europe | Drains & water re-use
Segment information
Net sales	20.8	21.6	62.7	67.1
Europe | Water quality
Segment information
Net sales	0.8	1.0	2.8	3.1
Europe | Reportable segments
Segment information
Operating income	12.5	12.6	53.2	53.3
Europe | Intersegment sales
Segment information
Net sales	6.0	6.2	19.9	20.2
APMEA
Segment information
Net sales	33.1	24.9	83.6	67.1
Capital expenditures	0.3	0.1	0.7	0.5
Depreciation and amortization	0.6	0.5	1.7	1.6
Identifiable assets (at end of period)	154.4	125.1	154.4	125.1
Property, plant and equipment, net (at end of period)	4.2	4.2	4.2	4.2
APMEA | Residential & commercial flow control
Segment information
Net sales	28.5	19.2	69.7	53.6
APMEA | HVAC & gas
Segment information
Net sales	3.8	4.4	11.5	10.4
APMEA | Drains & water re-use
Segment information
Net sales	0.6	0.9	1.8	2.1
APMEA | Water quality
Segment information
Net sales	0.2	0.4	0.6	1.0
APMEA | Reportable segments
Segment information
Operating income	5.4	4.1	11.9	10.7
APMEA | Intersegment sales
Segment information
Net sales	$ 16.8	$ 10.8	$ 67.4	$ 63.2