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Acquisitions - Narrative (Details) $ in Millions, $ in Millions				3 Months Ended									12 Months Ended
	Jul. 01, 2019 USD ($)	Jun. 02, 2017 USD ($)	Jun. 03, 2016 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Net sales					$ 314.4	$ 308.8	$ 324.3	$ 273.8	$ 279.4	$ 269.4	$ 291.0	$ 249.7		$ 1,221.3	$ 1,089.5	$ 898.5
Operating income														147.1	121.5	73.6
Other Payments to Acquire Businesses														3.1	0.0	0.0
Other Payments to Acquire Businesses, Financing Activity														10.3	0.0	0.0
Environmental Solutions
Business Acquisition [Line Items]
Net sales														992.9	863.5	692.6
Operating income														139.4	113.0	72.4
Safety And Security Systems
Business Acquisition [Line Items]
Net sales														228.4	226.0	205.9
Operating income														38.6	34.1	27.0
Corporate
Business Acquisition [Line Items]
Operating income														(30.9)	(25.6)	(25.8)
Ingenieria Y Servicios Orbitec SPA
Business Acquisition [Line Items]
Net sales from related parties														3.3	$ 1.7	$ 0.7
MRL
Business Acquisition [Line Items]
Purchase price, inclusive of preliminary working capital adjustment	$ 49.8
Contingent consideration maximum	$ 15.5
Net sales														39.7
Operating income														3.6
TBEI
Business Acquisition [Line Items]
Purchase price, inclusive of preliminary working capital adjustment		$ 271.8
Business acquisition purchase price adjustment												$ 3.0
Joe Johnson Equipment
Business Acquisition [Line Items]
Purchase price, inclusive of preliminary working capital adjustment			$ 96.6											13.4
Acquisition deferred payment													$ 7.6	5.8
Acquisition contingent earn-out													$ 10.0	$ 7.6
Subsequent Event | MRL
Business Acquisition [Line Items]
Business acquisition purchase price adjustment				$ 0.8

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