Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,196.4	$ 1,166.7	$ 2,283.7	$ 2,157.9
United States
Disaggregation of Revenue [Line Items]
Total net sales	1,098.2	1,054.1	2,095.1	1,949.2
International
Disaggregation of Revenue [Line Items]
Total net sales	98.2	112.6	188.6	208.7
Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	234.3	235.2	455.6	450.7
Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	207.3	207.4	395.6	393.9
Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	246.6	246.0	467.2	462.1
Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	508.2	478.1	965.3	851.2
Electrical
Disaggregation of Revenue [Line Items]
Total net sales	688.2	688.6	1,318.4	1,306.7
Electrical | United States
Disaggregation of Revenue [Line Items]
Total net sales	620.4	614.1	1,186.1	1,160.8
Electrical | International
Disaggregation of Revenue [Line Items]
Total net sales	67.8	74.5	132.3	145.9
Electrical | Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	234.3	235.2	455.6	450.7
Electrical | Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	207.3	207.4	395.6	393.9
Electrical | Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	246.6	246.0	467.2	462.1
Electrical | Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0	0.0	0.0
Power
Disaggregation of Revenue [Line Items]
Total net sales	508.2	478.1	965.3	851.2
Power | United States
Disaggregation of Revenue [Line Items]
Total net sales	477.8	440.0	909.0	788.4
Power | International
Disaggregation of Revenue [Line Items]
Total net sales	30.4	38.1	56.3	62.8
Power | Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0	0.0	0.0
Power | Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0	0.0	0.0
Power | Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	0.0	0.0	0.0	0.0
Power | Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	$ 508.2	$ 478.1	$ 965.3	$ 851.2