Revenue Recognition (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)	Apr. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 01, 2017 USD ($)	Jul. 02, 2017 USD ($)	Apr. 02, 2017 USD ($)	Dec. 31, 2018 segment	Dec. 31, 2018 item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disaggregation of Revenue
Number of distribution channels | item										4
Number of geographic segments									3	3
Revenue	$ 387.6	$ 390.9	$ 407.9	$ 378.5	$ 366.3	$ 364.7	$ 378.5	$ 347.2			$ 1,564.9	$ 1,456.7	$ 1,398.4
Wholesale
Disaggregation of Revenue
Revenue											952.9
OEM
Disaggregation of Revenue
Revenue											230.4
Specialty
Disaggregation of Revenue
Revenue											316.6
DIY
Disaggregation of Revenue
Revenue											65.0
Residential & commercial flow control
Disaggregation of Revenue
Revenue											804.4
HVAC & gas
Disaggregation of Revenue
Revenue											507.0
Drainage & water re-use
Disaggregation of Revenue
Revenue											163.1
Water quality
Disaggregation of Revenue
Revenue											90.4
Americas
Disaggregation of Revenue
Revenue											1,032.1	951.9	900.9
Americas | Wholesale
Disaggregation of Revenue
Revenue											578.8
Americas | OEM
Disaggregation of Revenue
Revenue											79.0
Americas | Specialty
Disaggregation of Revenue
Revenue											312.1
Americas | DIY
Disaggregation of Revenue
Revenue											62.2
Americas | Residential & commercial flow control
Disaggregation of Revenue
Revenue											582.0
Americas | HVAC & gas
Disaggregation of Revenue
Revenue											289.2
Americas | Drainage & water re-use
Disaggregation of Revenue
Revenue											73.1
Americas | Water quality
Disaggregation of Revenue
Revenue											87.8
Europe
Disaggregation of Revenue
Revenue											467.0	440.3	431.3
Europe | Wholesale
Disaggregation of Revenue
Revenue											314.2
Europe | OEM
Disaggregation of Revenue
Revenue											150.0
Europe | DIY
Disaggregation of Revenue
Revenue											2.8
Europe | Residential & commercial flow control
Disaggregation of Revenue
Revenue											176.2
Europe | HVAC & gas
Disaggregation of Revenue
Revenue											201.6
Europe | Drainage & water re-use
Disaggregation of Revenue
Revenue											87.8
Europe | Water quality
Disaggregation of Revenue
Revenue											1.4
APMEA
Disaggregation of Revenue
Revenue											65.8	$ 64.5	$ 66.2
APMEA | Wholesale
Disaggregation of Revenue
Revenue											59.9
APMEA | OEM
Disaggregation of Revenue
Revenue											1.4
APMEA | Specialty
Disaggregation of Revenue
Revenue											4.5
APMEA | Residential & commercial flow control
Disaggregation of Revenue
Revenue											46.2
APMEA | HVAC & gas
Disaggregation of Revenue
Revenue											16.2
APMEA | Drainage & water re-use
Disaggregation of Revenue
Revenue											2.2
APMEA | Water quality
Disaggregation of Revenue
Revenue											$ 1.2