Revenue Recognition - Revenue Disaggregated by Customer Type (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 | Original equipment manufacturers/ end-users
Disaggregation of Revenue [Line Items]
Total									766.8	768.5	690.5
Process & Motion Control | Maintenance, repair, and operations
Disaggregation of Revenue [Line Items]
Total									591.4	612.1	550.7
Water Management
Disaggregation of Revenue [Line Items]
Total									710.1	670.3	610.4
Water Management | Water safety, quality, flow control and conservation
Disaggregation of Revenue [Line Items]
Total									661.0	624.4	566.9
Water Management | Water infrastructure
Disaggregation of Revenue [Line Items]
Total									$ 49.1	$ 45.9	$ 43.5