Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,087.3	$ 991.2
United States
Disaggregation of Revenue [Line Items]
Total net sales	996.9	895.1
International
Disaggregation of Revenue [Line Items]
Total net sales	90.4	96.1
Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	221.3	215.5
Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	188.4	186.4
Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	220.5	216.2
Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	457.1	373.1
Electrical
Disaggregation of Revenue [Line Items]
Total net sales	630.2	618.1
Electrical | United States
Disaggregation of Revenue [Line Items]
Total net sales	565.7	546.7
Electrical | International
Disaggregation of Revenue [Line Items]
Total net sales	64.5	71.4
Electrical | Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	221.3	215.5
Electrical | Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	188.4	186.4
Electrical | Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	220.5	216.2
Electrical | Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0
Power
Disaggregation of Revenue [Line Items]
Total net sales	457.1	373.1
Power | United States
Disaggregation of Revenue [Line Items]
Total net sales	431.2	348.4
Power | International
Disaggregation of Revenue [Line Items]
Total net sales	25.9	24.7
Power | Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0
Power | Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0
Power | Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0
Power | Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	$ 457.1	$ 373.1