Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 01, 2018	Jul. 01, 2018
Disaggregation of Revenue
Revenue	$ 407.9	$ 786.4
Wholesale
Disaggregation of Revenue
Revenue	246.0	478.0
OEM
Disaggregation of Revenue
Revenue	58.3	117.4
Specialty
Disaggregation of Revenue
Revenue	87.7	156.5
DIY
Disaggregation of Revenue
Revenue	15.9	34.5
Americas
Disaggregation of Revenue
Revenue	272.0	513.1
Americas | Wholesale
Disaggregation of Revenue
Revenue	150.6	287.2
Americas | OEM
Disaggregation of Revenue
Revenue	20.1	39.2
Americas | Specialty
Disaggregation of Revenue
Revenue	86.1	153.7
Americas | DIY
Disaggregation of Revenue
Revenue	15.2	33.0
Europe
Disaggregation of Revenue
Revenue	117.1	240.1
Europe | Wholesale
Disaggregation of Revenue
Revenue	78.5	161.2
Europe | OEM
Disaggregation of Revenue
Revenue	37.9	77.4
Europe | DIY
Disaggregation of Revenue
Revenue	0.7	1.5
APMEA
Disaggregation of Revenue
Revenue	18.8	33.2
APMEA | Wholesale
Disaggregation of Revenue
Revenue	16.9	29.6
APMEA | OEM
Disaggregation of Revenue
Revenue	0.3	0.8
APMEA | Specialty
Disaggregation of Revenue
Revenue	1.6	2.8
Residential & commercial flow control
Disaggregation of Revenue
Revenue	208.9	405.6
Residential & commercial flow control | Americas
Disaggregation of Revenue
Revenue	151.0	290.9
Residential & commercial flow control | Europe
Disaggregation of Revenue
Revenue	44.7	92.0
Residential & commercial flow control | APMEA
Disaggregation of Revenue
Revenue	13.2	22.7
HVAC & gas
Disaggregation of Revenue
Revenue	135.0	255.7
HVAC & gas | Americas
Disaggregation of Revenue
Revenue	80.6	143.1
HVAC & gas | Europe
Disaggregation of Revenue
Revenue	49.4	103.3
HVAC & gas | APMEA
Disaggregation of Revenue
Revenue	5.0	9.3
Drains & water re-use
Disaggregation of Revenue
Revenue	41.9	80.3
Drains & water re-use | Americas
Disaggregation of Revenue
Revenue	18.9	35.4
Drains & water re-use | Europe
Disaggregation of Revenue
Revenue	22.6	44.2
Drains & water re-use | APMEA
Disaggregation of Revenue
Revenue	0.4	0.7
Water quality
Disaggregation of Revenue
Revenue	22.1	44.8
Water quality | Americas
Disaggregation of Revenue
Revenue	21.5	43.7
Water quality | Europe
Disaggregation of Revenue
Revenue	0.4	0.6
Water quality | APMEA
Disaggregation of Revenue
Revenue	$ 0.2	$ 0.5