Revenue Recognition - Revenue Disaggregated by Geography (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total	$ 547.0	$ 491.7	$ 521.3	$ 508.3	$ 537.5	$ 485.0	$ 524.8	$ 503.6	$ 2,068.3	$ 2,050.9	$ 1,851.6
Process & Motion Control
Disaggregation of Revenue [Line Items]
Total									1,358.2	1,380.6	1,241.2
Process & Motion Control | United States and Canada
Disaggregation of Revenue [Line Items]
Total									870.6	898.7	848.3
Process & Motion Control | Europe
Disaggregation of Revenue [Line Items]
Total									298.9	327.5	255.5
Process & Motion Control | Rest of world
Disaggregation of Revenue [Line Items]
Total									188.7	154.4	137.4
Water Management
Disaggregation of Revenue [Line Items]
Total									710.1	670.3	610.4
Water Management | United States and Canada
Disaggregation of Revenue [Line Items]
Total									694.1	654.5	598.4
Water Management | Europe
Disaggregation of Revenue [Line Items]
Total									0.0	0.0	0.0
Water Management | Rest of world
Disaggregation of Revenue [Line Items]
Total									$ 16.0	$ 15.8	$ 12.0