Revenue - Vertical Sales by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 520.9	$ 538.0
Enclosures
Disaggregation of Revenue [Line Items]
Net sales	258.5	255.5
Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	120.5	145.1
Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	141.9	137.4
Industrial
Disaggregation of Revenue [Line Items]
Net sales	229.0	240.5
Industrial | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	156.5	155.1
Industrial | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	46.5	58.7
Industrial | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	26.0	26.7
Commercial & Residential
Disaggregation of Revenue [Line Items]
Net sales	153.6	147.0
Commercial & Residential | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	31.7	22.6
Commercial & Residential | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	39.8	44.5
Commercial & Residential | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	82.1	79.9
Energy
Disaggregation of Revenue [Line Items]
Net sales	74.4	79.5
Energy | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	26.8	25.9
Energy | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	32.6	40.1
Energy | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	15.0	13.5
Infrastructure
Disaggregation of Revenue [Line Items]
Net sales	63.9	71.0
Infrastructure | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	43.5	51.9
Infrastructure | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	1.6	1.8
Infrastructure | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	18.8	17.3
Developed Europe (1)
Disaggregation of Revenue [Line Items]
Net sales	118.7	112.6
Developed Europe (1) | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	61.9	50.9
Developed Europe (1) | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	29.6	35.1
Developed Europe (1) | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	27.2	26.6
Developing Countries
Disaggregation of Revenue [Line Items]
Net sales	45.0	52.8
Developing Countries | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	19.4	21.7
Developing Countries | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	16.9	21.0
Developing Countries | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	8.7	10.1
Other Developed Countries
Disaggregation of Revenue [Line Items]
Net sales	10.0	10.9
Other Developed Countries | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	3.1	2.5
Other Developed Countries | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	3.4	5.1
Other Developed Countries | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	3.5	3.3
U.S. and Canada
Disaggregation of Revenue [Line Items]
Net sales	347.2	361.7
U.S. and Canada | Enclosures
Disaggregation of Revenue [Line Items]
Net sales	174.1	180.4
U.S. and Canada | Thermal Management
Disaggregation of Revenue [Line Items]
Net sales	70.6	83.9
U.S. and Canada | Electrical & Fastening Solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 102.5	$ 97.4