Revenue Recognition (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 segment	Sep. 30, 2018 item	Sep. 30, 2018 USD ($)
Disaggregation of Revenue
Number of distribution channels | item			4
Number of geographic segments		3	3
Revenue	$ 390.9			$ 1,177.3
Wholesale
Disaggregation of Revenue
Revenue	235.0			713.0
OEM
Disaggregation of Revenue
Revenue	57.2			174.6
Specialty
Disaggregation of Revenue
Revenue	84.2			240.7
DIY
Disaggregation of Revenue
Revenue	14.5			49.0
Americas
Disaggregation of Revenue
Revenue	262.7			775.8
Americas | Wholesale
Disaggregation of Revenue
Revenue	146.7			433.9
Americas | OEM
Disaggregation of Revenue
Revenue	19.4			58.6
Americas | Specialty
Disaggregation of Revenue
Revenue	82.7			236.4
Americas | DIY
Disaggregation of Revenue
Revenue	13.9			46.9
Europe
Disaggregation of Revenue
Revenue	111.6			351.7
Europe | Wholesale
Disaggregation of Revenue
Revenue	73.5			234.7
Europe | OEM
Disaggregation of Revenue
Revenue	37.5			114.9
Europe | DIY
Disaggregation of Revenue
Revenue	0.6			2.1
APMEA
Disaggregation of Revenue
Revenue	16.6			49.8
APMEA | Wholesale
Disaggregation of Revenue
Revenue	14.8			44.4
APMEA | OEM
Disaggregation of Revenue
Revenue	0.3			1.1
APMEA | Specialty
Disaggregation of Revenue
Revenue	1.5			4.3
Residential & commercial flow control
Disaggregation of Revenue
Revenue	195.8			601.3
Residential & commercial flow control | Americas
Disaggregation of Revenue
Revenue	144.4			435.3
Residential & commercial flow control | Europe
Disaggregation of Revenue
Revenue	40.2			132.2
Residential & commercial flow control | APMEA
Disaggregation of Revenue
Revenue	11.2			33.8
HVAC & gas
Disaggregation of Revenue
Revenue	130.8			386.5
HVAC & gas | Americas
Disaggregation of Revenue
Revenue	77.1			220.2
HVAC & gas | Europe
Disaggregation of Revenue
Revenue	49.4			152.7
HVAC & gas | APMEA
Disaggregation of Revenue
Revenue	4.3			13.6
Drainage & water re-use
Disaggregation of Revenue
Revenue	42.2			122.5
Drainage & water re-use | Americas
Disaggregation of Revenue
Revenue	19.8			55.2
Drainage & water re-use | Europe
Disaggregation of Revenue
Revenue	21.7			65.9
Drainage & water re-use | APMEA
Disaggregation of Revenue
Revenue	0.7			1.4
Water quality
Disaggregation of Revenue
Revenue	22.1			67.0
Water quality | Americas
Disaggregation of Revenue
Revenue	21.4			65.1
Water quality | Europe
Disaggregation of Revenue
Revenue	0.3			0.9
Water quality | APMEA
Disaggregation of Revenue
Revenue	$ 0.4			$ 1.0