Revenue - Vertical Sales by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 447.2	$ 539.5	$ 968.1	$ 1,077.5
Enclosures
Disaggregation of Revenue [Line Items]
Net sales	219.3	260.0	477.8	515.5
Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	95.8	128.8	216.3	273.9
Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	132.1	150.7	274.0	288.1
Industrial
Disaggregation of Revenue [Line Items]
Net sales	195.2	239.4	424.2	479.9
Industrial | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	133.6	154.8	290.1	309.9
Industrial | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	35.7	54.7	82.2	113.4
Industrial | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	25.9	29.9	51.9	56.6
Commercial & Residential
Disaggregation of Revenue [Line Items]
Net sales	128.6	154.5	282.2	301.5
Commercial & Residential | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	23.7	26.7	55.4	49.3
Commercial & Residential | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	32.8	39.9	72.6	84.4
Commercial & Residential | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	72.1	87.9	154.2	167.8
Energy
Disaggregation of Revenue [Line Items]
Net sales	60.0	72.8	134.4	152.3
Energy | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	18.5	26.2	45.3	52.1
Energy | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	26.1	31.9	58.7	72.0
Energy | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	15.4	14.7	30.4	28.2
Infrastructure
Disaggregation of Revenue [Line Items]
Net sales	63.4	72.8	127.3	143.8
Infrastructure | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	43.5	52.3	87.0	104.2
Infrastructure | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	1.2	2.3	2.8	4.1
Infrastructure | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	18.7	18.2	37.5	35.5
Developed Europe (1)
Disaggregation of Revenue [Line Items]
Net sales	100.9	105.9	219.6	218.5
Developed Europe (1) | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	55.5	47.5	117.4	98.4
Developed Europe (1) | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	24.0	30.2	53.6	65.3
Developed Europe (1) | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	21.4	28.2	48.6	54.8
Developing Countries
Disaggregation of Revenue [Line Items]
Net sales	42.3	55.0	87.3	107.8
Developing Countries | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	19.6	23.6	39.0	45.3
Developing Countries | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	16.4	21.9	33.3	42.9
Developing Countries | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	6.3	9.5	15.0	19.6
Other Developed Countries
Disaggregation of Revenue [Line Items]
Net sales	11.4	9.5	21.4	20.4
Other Developed Countries | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	3.4	2.8	6.5	5.3
Other Developed Countries | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	4.2	3.3	7.6	8.4
Other Developed Countries | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	3.8	3.4	7.3	6.7
U.S. and Canada
Disaggregation of Revenue [Line Items]
Net sales	292.6	369.1	639.8	730.8
U.S. and Canada | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	140.8	186.1	314.9	366.5
U.S. and Canada | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	51.2	73.4	121.8	157.3
U.S. and Canada | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 100.6	$ 109.6	$ 203.1	$ 207.0