Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,100.1	$ 1,083.4	$ 1,054.3	$ 956.3	$ 917.1	$ 970.3	$ 837.5	$ 957.6	$ 4,194.1	$ 3,682.5	$ 3,946.6
Cost of goods sold	810.2	782.3	756.0	694.1	656.9	677.5	582.3	680.0	3,042.6	2,596.7	2,775.0
Gross profit	289.9	301.1	298.3	262.2	260.2	292.8	255.2	277.6	1,151.5	1,085.8	1,171.6
Selling & administrative expenses	155.6	155.2	156.1	152.3	145.6	144.8	129.9	171.0	619.2	591.3	644.9
Net income from continuing operations	101.3	105.5	89.6	74.7	81.4	98.5	86.9	67.9	371.1	334.7	368.0
Net income from continuing operations attributable to Hubbell	$ 99.5	$ 103.4	$ 88.8	$ 73.3	$ 79.8	$ 97.1	$ 85.9	$ 67.2	$ 365.0	$ 330.0	$ 361.5
Basic earnings per share from continuing operations (USD per share)	$ 1.82	$ 1.89	$ 1.63	$ 1.34	$ 1.47	$ 1.79	$ 1.58	$ 1.23	$ 6.70	$ 6.07	$ 6.63
Basic earnings per share from discontinued operations (USD per share)	0.33	0.10	0.13	0.09	0.02	0.18	0.04	0.15	0.63	0.39	0.72
Basic earnings per share (USD per share)	2.15	1.99	1.76	1.43	1.49	1.97	1.62	1.38	7.33	6.46	7.35
Diluted earnings per share from continuing operations (USD per share)	1.81	1.88	1.62	1.33	1.46	1.78	1.58	1.23	6.66	6.04	6.59
Diluted earnings per share from discontinued operations (USD per share)	0.33	0.10	0.12	0.09	0.02	0.18	0.04	0.14	0.62	0.39	0.72
Diluted earnings per share (USD per share)	$ 2.14	$ 1.98	$ 1.74	$ 1.42	$ 1.48	$ 1.96	$ 1.62	$ 1.37	$ 7.28	$ 6.43	$ 7.31