Segment Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 520.9	$ 538.0
Segment income	60.3	77.5
Enclosures
Segment Reporting Information [Line Items]
Net sales	258.5	255.5
Segment income	40.9	45.6
Thermal Management
Segment Reporting Information [Line Items]
Net sales	120.5	145.1
Segment income	20.3	34.3
Electrical & Fastening Solutions
Segment Reporting Information [Line Items]
Net sales	141.9	137.4
Segment income	33.5	31.2
Other
Segment Reporting Information [Line Items]
Segment income	(13.2)	(14.9)
Operating Segments
Segment Reporting Information [Line Items]
Segment income	$ 81.5	$ 96.2