Segment Information (Details) $ in Millions	3 Months Ended										12 Months Ended
	Dec. 31, 2017 USD ($)	Oct. 01, 2017 USD ($)	Jul. 02, 2017 USD ($)	Apr. 02, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 02, 2016 USD ($)	Jul. 03, 2016 USD ($)	Apr. 03, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 27, 2015 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment information
Number of geographic segments | item											3
Net Sales	$ 366.3	$ 364.7	$ 378.5	$ 347.2	$ 342.0	$ 341.1	$ 371.1	$ 344.2			$ 1,456.7	$ 1,398.4	$ 1,467.7
Consolidated operating income (loss)											162.3	145.0	(90.1)
Interest income											(1.0)	(1.0)	(1.0)
Interest expense											19.1	22.6	24.3
Other expense (income), net											1.1	(4.4)	(2.4)
INCOME (LOSS) BEFORE INCOME TAXES											143.1	127.8	(111.0)
Capital Expenditures											29.4	36.0	27.7
Depreciation and Amortization											52.2	51.2	52.4
Identifiable assets (at end of period)	1,736.5				1,763.2				$ 1,690.8		1,736.5	1,763.2	1,690.8
Property, plant and equipment, net (at end of period)	198.5				189.7				184.4		$ 198.5	189.7	184.4
Charges related to Pension Plan and SERP benefit obligations										$ 59.7
Gain on disposition												8.7
Number of product categories | item											4
Residential & commercial flow control
Segment information
Net Sales											$ 758.9	779.2	831.1
HVAC & gas
Segment information
Net Sales											472.4	408.1	425.1
Drains & water re-use
Segment information
Net Sales											145.4	132.3	131.0
Water quality
Segment information
Net Sales											80.0	78.8	80.5
Reportable segments
Segment information
Consolidated operating income (loss)											199.1	182.2	10.8
Corporate
Segment information
Consolidated operating income (loss)											(36.8)	(37.2)	(100.9)
Charges related to Pension Plan and SERP benefit obligations													59.7
Intersegment sales
Segment information
Net Sales											96.4	101.0	128.7
Americas
Segment information
Net Sales											951.9	900.9	978.5
Capital Expenditures											20.7	25.7	19.0
Depreciation and Amortization											30.8	28.8	29.0
Identifiable assets (at end of period)	1,069.2				1,054.7				969.6		1,069.2	1,054.7	969.6
Property, plant and equipment, net (at end of period)	109.3				106.2				88.6		109.3	106.2	88.6
Americas | U.S.
Segment information
Net Sales											886.2	839.2	909.2
Property, plant and equipment, net (at end of period)	105.1				102.5				85.2		105.1	102.5	85.2
Americas | Reportable segments
Segment information
Consolidated operating income (loss)											146.8	127.1	109.9
Americas | Intersegment sales
Segment information
Net Sales											12.1	12.0	8.2
Europe
Segment information
Net Sales											440.3	431.3	436.0
Capital Expenditures											8.0	8.9	7.5
Depreciation and Amortization											18.6	19.3	21.0
Identifiable assets (at end of period)	524.0				577.3				602.2		524.0	577.3	602.2
Property, plant and equipment, net (at end of period)	82.1				75.6				82.2		82.1	75.6	82.2
Goodwill impairment charge									129.7				129.7
Europe | Reportable segments
Segment information
Consolidated operating income (loss)											47.6	40.0	(99.6)
Europe | Intersegment sales
Segment information
Net Sales											14.6	12.3	10.5
APMEA
Segment information
Net Sales											64.5	66.2	53.2
Capital Expenditures											0.7	1.4	1.2
Depreciation and Amortization											2.8	3.1	2.4
Identifiable assets (at end of period)	143.3				131.2				119.0		143.3	131.2	119.0
Property, plant and equipment, net (at end of period)	$ 7.1				$ 7.9				$ 13.6		7.1	7.9	13.6
Gain on disposition												8.7
APMEA | Reportable segments
Segment information
Consolidated operating income (loss)											4.7	15.1	0.5
APMEA | Intersegment sales
Segment information
Net Sales											$ 69.7	$ 76.7	$ 110.0