Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2022 USD ($)	Sep. 26, 2021 USD ($)	Sep. 25, 2022 USD ($) segment	Sep. 26, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment information
Number of geographic segments | segment			3
Net sales	$ 487.8	$ 455.0	$ 1,477.6	$ 1,335.3
Operating income	80.4	64.7	247.8	177.0
Interest income	(0.2)		(0.3)
Interest expense	1.9	1.4	5.0	4.9
Other (income) expense, net	(0.1)	(0.2)	0.2	(1.0)
INCOME BEFORE INCOME TAXES	78.8	63.5	242.9	173.1
Capital expenditures	7.1	6.6	20.2	19.6
Depreciation and amortization	10.2	10.7	30.6	34.0
Identifiable assets (at end of period)	1,885.6	1,863.2	1,885.6	1,863.2	$ 1,855.6
Property, plant and equipment, net (at end of period)	189.1	204.2	189.1	204.2	$ 200.7
Residential & commercial flow control
Segment information
Net sales	252.0	235.5	768.7	707.2
HVAC & gas
Segment information
Net sales	149.4	143.6	458.3	408.4
Drains & water re-use
Segment information
Net sales	52.5	47.1	151.8	134.5
Water quality
Segment information
Net sales	33.9	28.8	98.8	85.2
U.S.
Segment information
Net sales	327.1	288.7	973.5	828.1
Reportable segments
Segment information
Operating income	92.9	78.4	283.6	213.6
Corporate
Segment information
Operating income	(12.5)	(13.7)	(35.8)	(36.6)
Intersegment sales
Segment information
Net sales	19.5	41.4	91.3	125.9
Americas
Segment information
Net sales	349.8	309.1	1,039.6	889.0
Capital expenditures	3.2	5.3	11.0	12.6
Depreciation and amortization	7.3	7.3	21.0	22.4
Identifiable assets (at end of period)	1,220.8	1,150.0	1,220.8	1,150.0
Property, plant and equipment, net (at end of period)	122.0	120.9	122.0	120.9
Americas | Residential & commercial flow control
Segment information
Net sales	196.0	173.5	586.0	513.0
Americas | HVAC & gas
Segment information
Net sales	91.3	82.9	276.3	226.4
Americas | Drains & water re-use
Segment information
Net sales	30.0	25.2	82.6	69.0
Americas | Water quality
Segment information
Net sales	32.5	27.5	94.7	80.6
Americas | U.S.
Segment information
Property, plant and equipment, net (at end of period)	117.1	116.4	117.1	116.4
Americas | Reportable segments
Segment information
Operating income	76.2	55.9	219.6	159.6
Americas | Intersegment sales
Segment information
Net sales	2.5	2.5	7.9	7.4
Europe
Segment information
Net sales	113.1	124.1	370.9	383.8
Capital expenditures	3.8	1.3	8.7	6.6
Depreciation and amortization	2.4	3.2	8.0	9.5
Identifiable assets (at end of period)	539.7	571.0	539.7	571.0
Property, plant and equipment, net (at end of period)	62.9	78.4	62.9	78.4
Europe | Residential & commercial flow control
Segment information
Net sales	36.8	44.5	129.1	143.4
Europe | HVAC & gas
Segment information
Net sales	53.7	57.5	171.6	172.9
Europe | Drains & water re-use
Segment information
Net sales	21.6	21.1	67.1	63.8
Europe | Water quality
Segment information
Net sales	1.0	1.0	3.1	3.7
Europe | Reportable segments
Segment information
Operating income	12.6	18.3	53.3	43.2
Europe | Intersegment sales
Segment information
Net sales	6.2	6.7	20.2	22.9
APMEA
Segment information
Net sales	24.9	21.8	67.1	62.5
Capital expenditures	0.1		0.5	0.4
Depreciation and amortization	0.5	0.2	1.6	2.1
Identifiable assets (at end of period)	125.1	142.2	125.1	142.2
Property, plant and equipment, net (at end of period)	4.2	4.9	4.2	4.9
APMEA | Residential & commercial flow control
Segment information
Net sales	19.2	17.5	53.6	50.8
APMEA | HVAC & gas
Segment information
Net sales	4.4	3.2	10.4	9.1
APMEA | Drains & water re-use
Segment information
Net sales	0.9	0.8	2.1	1.7
APMEA | Water quality
Segment information
Net sales	0.4	0.3	1.0	0.9
APMEA | Reportable segments
Segment information
Operating income	4.1	4.2	10.7	10.8
APMEA | Intersegment sales
Segment information
Net sales	$ 10.8	$ 32.2	$ 63.2	$ 95.6