Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Numerator:
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
Less: Earnings allocated to participating securities									(1.1)	(1.1)	(1.3)
Net income from continuing operations available to common shareholders									363.9	328.9	360.2
Net income from discontinued operations attributable to Hubbell Incorporated									34.5	21.2	39.4
Less: Earnings allocated to participating securities									(0.1)	(0.1)	(0.1)
Net income from discontinued operations available to common shareholders									34.4	21.1	39.3
Net income attributable to Hubbell Incorporated									399.5	351.2	400.9
Less: Earnings allocated to participating securities									(1.2)	(1.2)	(1.4)
Net income available to common shareholders									$ 398.3	$ 350.0	$ 399.5
Denominator:
Average number of common shares outstanding (shares)									54.3	54.2	54.4
Potential dilutive shares (shares)									0.4	0.3	0.3
Average number of diluted shares outstanding (shares)									54.7	54.5	54.7
Basic earnings per share:
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:
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