Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
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
Cost of goods sold	777.3	842.0	839.0	780.0	823.5	830.7	818.8	708.3	3,238.3	3,181.3	2,513.7
Gross profit	326.0	362.0	357.4	307.3	320.6	349.0	347.9	282.9	1,352.7	1,300.4	1,155.1
Selling & administrative expenses	190.1	189.1	190.5	186.4	184.0	185.2	191.0	183.3	756.1	743.5	636.3
Net income	103.1	132.6	97.9	73.8	89.2	114.7	102.4	59.8	407.4	366.1	249.9
Net income attributable to Hubbell	$ 101.9	$ 130.7	$ 96.0	$ 72.3	$ 88.0	$ 113.6	$ 100.3	$ 58.3	$ 400.9	$ 360.2	$ 243.1
Earning Per Share - Basic (USD per share)	$ 1.87	$ 2.40	$ 1.76	$ 1.32	$ 1.61	$ 2.07	$ 1.83	$ 1.06	$ 7.35	$ 6.57	$ 4.42
Earning Per Share - Diluted (USD per share)	$ 1.85	$ 2.38	$ 1.75	$ 1.32	$ 1.60	$ 2.06	$ 1.82	$ 1.05	$ 7.31	$ 6.54	$ 4.39