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Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jul. 01, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2019 USD ($) item	Jul. 01, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment information
Number of geographic segments				3	3
Revenue	$ 416.8	$ 407.9	$ 805.5			$ 786.4
Consolidated operating income (loss)	54.3	52.2	101.0			96.1
Interest income	(0.1)	(0.1)	(0.2)			(0.5)
Interest expense	3.7	4.4	7.3			8.7
Other expense, net	(0.1)	(1.8)	0.4			(1.1)
INCOME BEFORE INCOME TAXES	50.8	49.7	93.5			89.0
Capital Expenditures	7.4	7.9	14.3			15.2
Depreciation and Amortization	11.4	12.3	22.8			25.0
Identifiable assets (at end of period)	1,678.4	1,647.3	1,678.4	$ 1,678.4	$ 1,678.4	1,647.3	$ 1,653.7
Property, plant and equipment, net (at end of period)	200.9	196.2	200.9	200.9	200.9	196.2	$ 201.9
Residential & commercial flow control
Segment information
Revenue	216.5	208.9	420.1			405.6
HVAC & gas
Segment information
Revenue	129.3	135.0	248.5			255.7
Drainage & water re-use
Segment information
Revenue	45.7	41.9	86.2			80.3
Water quality
Segment information
Revenue	25.3	22.1	50.7			44.8
U.S.
Segment information
Property, plant and equipment, net (at end of period)	109.9	107.6	109.9	109.9	109.9	107.6
Reportable segments
Segment information
Consolidated operating income (loss)	64.7	61.2	122.2			113.9
Corporate
Segment information
Consolidated operating income (loss)	(10.4)	(9.0)	(21.2)			(17.8)
Intersegment sales
Segment information
Revenue	26.0	31.6	49.5			54.3
Americas
Segment information
Revenue	287.0	272.0	545.9			513.1
Capital Expenditures	3.6	5.3	7.5			9.9
Depreciation and Amortization	7.2	7.2	14.3			14.3
Identifiable assets (at end of period)	1,052.4	1,027.3	1,052.4	1,052.4	1,052.4	1,027.3
Property, plant and equipment, net (at end of period)	114.0	111.6	114.0	114.0	114.0	111.6
Americas | Residential & commercial flow control
Segment information
Revenue	161.3	151.0	308.7			290.9
Americas | HVAC & gas
Segment information
Revenue	79.8	80.6	148.5			143.1
Americas | Drainage & water re-use
Segment information
Revenue	21.6	18.9	39.7			35.4
Americas | Water quality
Segment information
Revenue	24.3	21.5	49.0			43.7
Americas | U.S.
Segment information
Revenue	269.4	254.3	512.9			479.5
Americas | Reportable segments
Segment information
Consolidated operating income (loss)	50.7	46.7	93.8			83.1
Americas | Intersegment sales
Segment information
Revenue	3.0	3.4	5.9			6.0
Europe
Segment information
Revenue	113.2	117.1	229.5			240.1
Capital Expenditures	3.5	2.2	6.5			4.7
Depreciation and Amortization	3.5	4.5	7.1			9.4
Identifiable assets (at end of period)	516.3	510.1	516.3	516.3	516.3	510.1
Property, plant and equipment, net (at end of period)	80.5	77.8	80.5	80.5	80.5	77.8
Europe | Residential & commercial flow control
Segment information
Revenue	43.6	44.7	89.1			92.0
Europe | HVAC & gas
Segment information
Revenue	45.9	49.4	94.3			103.3
Europe | Drainage & water re-use
Segment information
Revenue	23.0	22.6	44.9			44.2
Europe | Water quality
Segment information
Revenue	0.7	0.4	1.2			0.6
Europe | Reportable segments
Segment information
Consolidated operating income (loss)	12.8	12.9	26.0			27.8
Europe | Intersegment sales
Segment information
Revenue	4.2	3.5	7.9			6.9
APMEA
Segment information
Revenue	16.6	18.8	30.1			33.2
Capital Expenditures	0.3	0.4	0.3			0.6
Depreciation and Amortization	0.7	0.6	1.4			1.3
Identifiable assets (at end of period)	109.7	109.9	109.7	109.7	109.7	109.9
Property, plant and equipment, net (at end of period)	6.4	6.8	6.4	$ 6.4	$ 6.4	6.8
APMEA | Residential & commercial flow control
Segment information
Revenue	11.6	13.2	22.3			22.7
APMEA | HVAC & gas
Segment information
Revenue	3.6	5.0	5.7			9.3
APMEA | Drainage & water re-use
Segment information
Revenue	1.1	0.4	1.6			0.7
APMEA | Water quality
Segment information
Revenue	0.3	0.2	0.5			0.5
APMEA | Reportable segments
Segment information
Consolidated operating income (loss)	1.2	1.6	2.4			3.0
APMEA | Intersegment sales
Segment information
Revenue	$ 18.8	$ 24.7	$ 35.7			$ 41.4

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