Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 2,936.9	$ 3,283.1	$ 3,345.5
Fluid Handling | Process Valves and Related Products
Disaggregation of Revenue [Line Items]
Net sales	631.6	685.1	685.4
Fluid Handling | Commercial Valves
Disaggregation of Revenue [Line Items]
Net sales	286.3	332.1	325.4
Fluid Handling | Other Products
Disaggregation of Revenue [Line Items]
Net sales	87.9	100.2	91.0
Fluid Handling | Outside
Disaggregation of Revenue [Line Items]
Net sales	1,005.8	1,117.4	1,101.8
Payment & Merchandising Technologies | Outside
Disaggregation of Revenue [Line Items]
Net sales	1,104.8	1,158.3	1,257.0
Payment & Merchandising Technologies | Payment Acceptance and Dispensing Products
Disaggregation of Revenue [Line Items]
Net sales	670.8	805.5	798.8
Payment & Merchandising Technologies | Banknotes and Security Products
Disaggregation of Revenue [Line Items]
Net sales	434.0	352.8	458.2
Aerospace & Electronics | Outside
Disaggregation of Revenue [Line Items]
Net sales	650.7	798.8	743.5
Aerospace & Electronics | Commercial Original Equipment
Disaggregation of Revenue [Line Items]
Net sales	226.4	357.2	343.4
Aerospace & Electronics | Military Original Equipment
Disaggregation of Revenue [Line Items]
Net sales	258.7	217.2	195.7
Aerospace & Electronics | Commercial Aftermarket Products
Disaggregation of Revenue [Line Items]
Net sales	93.0	161.4	150.5
Aerospace & Electronics | Military Aftermarket Products
Disaggregation of Revenue [Line Items]
Net sales	72.6	63.0	53.9
Engineered Materials | Outside
Disaggregation of Revenue [Line Items]
Net sales	175.6	208.6	243.2
Engineered Materials | FRP - Recreational Vehicles
Disaggregation of Revenue [Line Items]
Net sales	68.9	84.5	119.0
Engineered Materials | FRP - Building Products
Disaggregation of Revenue [Line Items]
Net sales	83.1	91.9	92.2
Engineered Materials | FRP - Transportation
Disaggregation of Revenue [Line Items]
Net sales	$ 23.6	$ 32.2	$ 32.0