Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 1,103.3	$ 1,204.0	$ 1,196.4	$ 1,087.3	$ 1,144.1	$ 1,179.7	$ 1,166.7	$ 991.2	$ 4,591.0	$ 4,481.7	$ 3,668.8
Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Net sales									902.1	910.8	864.5
Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Net sales									808.7	799.7	732.6
Hubbell Lighting
Disaggregation of Revenue [Line Items]
Net sales									914.9	950.1	935.7
Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Net sales									1,965.3	1,821.1	1,136.0
United States
Disaggregation of Revenue [Line Items]
Net sales									4,190.5	4,040.6	3,280.9
International
Disaggregation of Revenue [Line Items]
Net sales									400.5	441.1	387.9
Electrical
Disaggregation of Revenue [Line Items]
Net sales									2,625.7	2,660.6	2,532.8
Electrical | United States
Disaggregation of Revenue [Line Items]
Net sales									2,358.2	2,365.4	2,229.3
Electrical | International
Disaggregation of Revenue [Line Items]
Net sales									267.5	295.2	303.5
Power
Disaggregation of Revenue [Line Items]
Net sales									1,965.3	1,821.1	1,136.0
Power | United States
Disaggregation of Revenue [Line Items]
Net sales									1,832.3	1,675.2	1,051.6
Power | International
Disaggregation of Revenue [Line Items]
Net sales									$ 133.0	$ 145.9	$ 84.4