Segment Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 447.2	$ 539.5	$ 968.1	$ 1,077.5
Segment income	45.3	87.0	105.6	164.5
Enclosures
Segment Reporting Information [Line Items]
Net sales	219.3	260.0	477.8	515.5
Segment income	28.2	48.2	69.1	93.8
Thermal Management
Segment Reporting Information [Line Items]
Net sales	95.8	128.8	216.3	273.9
Segment income	14.4	25.3	34.7	59.6
Electrical & Fastening Solutions
Segment Reporting Information [Line Items]
Net sales	132.1	150.7	274.0	288.1
Segment income	34.7	41.6	68.2	72.8
Other
Segment Reporting Information [Line Items]
Segment income	(9.0)	(10.3)	(22.2)	(25.2)
Operating Segments
Segment Reporting Information [Line Items]
Segment income	$ 68.3	$ 104.8	$ 149.8	$ 201.0