Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total net sales	$ 1,204.0	$ 1,179.7	$ 3,487.7	$ 3,337.6
United States
Disaggregation of Revenue [Line Items]
Total net sales	1,095.9	1,063.3	3,191.0	3,012.5
International
Disaggregation of Revenue [Line Items]
Total net sales	108.1	116.4	296.7	325.1
Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	237.0	234.2	692.6	685.0
Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	213.0	204.9	608.7	598.7
Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	239.3	248.3	706.4	710.4
Hubbell Power Systems
Disaggregation of Revenue [Line Items]
Total net sales	514.7	492.3	1,480.0	1,343.5
Electrical
Disaggregation of Revenue [Line Items]
Total net sales	689.3	687.4	2,007.7	1,994.1
Electrical | United States
Disaggregation of Revenue [Line Items]
Total net sales	618.2	615.3	1,804.3	1,776.1
Electrical | International
Disaggregation of Revenue [Line Items]
Total net sales	71.1	72.1	203.4	218.0
Electrical | Hubbell Commercial and Industrial
Disaggregation of Revenue [Line Items]
Total net sales	237.0	234.2	692.6	685.0
Electrical | Hubbell Construction and Energy
Disaggregation of Revenue [Line Items]
Total net sales	213.0	204.9	608.7	598.7
Electrical | Hubbell Lighting
Disaggregation of Revenue [Line Items]
Total net sales	239.3	248.3	706.4	710.4
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	514.7	492.3	1,480.0	1,343.5
Power | United States
Disaggregation of Revenue [Line Items]
Total net sales	477.7	448.0	1,386.7	1,236.4
Power | International
Disaggregation of Revenue [Line Items]
Total net sales	37.0	44.3	93.3	107.1
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	$ 514.7	$ 492.3	$ 1,480.0	$ 1,343.5