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Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
Segment Information (Details) $ in Millions	Sep. 27, 2020 USD ($)	Sep. 29, 2019 USD ($)	Sep. 27, 2020 USD ($)	Sep. 27, 2020 USD ($) segment	Sep. 27, 2020 USD ($) item	Sep. 29, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment information
Number of geographic segments				3	3
Revenue	$ 383.9	$ 394.7	$ 1,105.2			$ 1,200.2
Consolidated operating income	47.9	48.8	126.7			149.8
Interest income		(0.1)	(0.2)			(0.3)
Interest expense	3.0	3.5	10.0			10.8
Other (income) expense, net	1.1	(0.8)	1.0			(0.4)
INCOME BEFORE INCOME TAXES	43.8	46.2	115.9			139.7
Capital Expenditures	10.0	4.7	33.8			19.1
Depreciation and Amortization	11.8	11.6	34.7			34.3
Identifiable assets (at end of period)	1,709.0	1,696.3	1,709.0	$ 1,709.0	$ 1,709.0	1,696.3	$ 1,723.1
Property, plant and equipment, net (at end of period)	211.3	195.8	211.3	211.3	211.3	195.8	$ 200.0
Gain on disposition	(0.6)		(0.6)
Residential & Commercial Flow Control
Segment information
Revenue	205.3	202.7	573.5			622.7
HVAC & Gas Products
Segment information
Revenue	113.1	122.5	332.1			370.9
Drainage & Water Re-use Products
Segment information
Revenue	37.8	43.5	117.8			129.8
Water Quality Products
Segment information
Revenue	27.7	26.0	81.8			76.8
Reportable segments
Segment information
Consolidated operating income	57.7	62.0	154.2			184.3
Corporate
Segment information
Consolidated operating income	(9.8)	(13.2)	(27.5)			(34.5)
Intersegment sales
Segment information
Revenue	25.0	24.3	74.5			73.8
Americas
Segment information
Revenue	261.5	270.3	761.3			816.2
Capital Expenditures	6.9	3.1	24.5			10.5
Depreciation and Amortization	7.5	7.3	22.4			21.6
Identifiable assets (at end of period)	1,105.8	1,098.1	1,105.8	1,105.8	1,105.8	1,098.1
Property, plant and equipment, net (at end of period)	125.6	113.5	125.6	125.6	125.6	113.5
Americas \| Residential & Commercial Flow Control
Segment information
Revenue	151.1	151.0	430.5			459.7
Americas \| HVAC & Gas Products
Segment information
Revenue	63.9	73.4	194.5			221.9
Americas \| Drainage & Water Re-use Products
Segment information
Revenue	20.0	20.7	57.9			60.4
Americas \| Water Quality Products
Segment information
Revenue	26.5	25.2	78.4			74.2
Americas \| U.S.
Segment information
Revenue	242.5	252.0	711.8			764.9
Property, plant and equipment, net (at end of period)	121.8	109.6	121.8	121.8	121.8	109.6
Americas \| Reportable segments
Segment information
Consolidated operating income	47.3	48.5	120.2			142.3
Americas \| Intersegment sales
Segment information
Revenue	1.6	3.2	7.1			9.1
Europe
Segment information
Revenue	106.7	107.9	305.0			337.4
Capital Expenditures	2.5	1.5	8.5			8.1
Depreciation and Amortization	3.7	3.6	10.5			10.7
Identifiable assets (at end of period)	494.1	504.6	494.1	494.1	494.1	504.6
Property, plant and equipment, net (at end of period)	80.3	76.4	80.3	80.3	80.3	76.4
Europe \| Residential & Commercial Flow Control
Segment information
Revenue	42.2	41.1	113.9			130.1
Europe \| HVAC & Gas Products
Segment information
Revenue	46.3	44.7	129.1			139.0
Europe \| Drainage & Water Re-use Products
Segment information
Revenue	17.3	21.5	59.3			66.4
Europe \| Water Quality Products
Segment information
Revenue	0.9	0.6	2.7			1.9
Europe \| Reportable segments
Segment information
Consolidated operating income	10.4	12.1	33.3			38.1
Europe \| Intersegment sales
Segment information
Revenue	4.2	3.4	13.7			11.3
APMEA
Segment information
Revenue	15.7	16.5	38.9			46.6
Capital Expenditures	0.6	0.1	0.8			0.5
Depreciation and Amortization	0.6	0.7	1.8			2.0
Identifiable assets (at end of period)	109.1	93.6	109.1	109.1	109.1	93.6
Property, plant and equipment, net (at end of period)	5.4	5.9	5.4	$ 5.4	$ 5.4	5.9
APMEA \| Residential & Commercial Flow Control
Segment information
Revenue	12.0	10.6	29.1			32.9
APMEA \| HVAC & Gas Products
Segment information
Revenue	2.9	4.4	8.5			10.0
APMEA \| Drainage & Water Re-use Products
Segment information
Revenue	0.5	1.3	0.6			3.0
APMEA \| Water Quality Products
Segment information
Revenue	0.3	0.2	0.7			0.7
APMEA \| Reportable segments
Segment information
Consolidated operating income		1.4	0.7			3.9
APMEA \| Intersegment sales
Segment information
Revenue	$ 19.2	$ 17.7	$ 53.7			$ 53.4