Earnings Per Share - Schedule of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income from continuing operations attributable to Hubbell Incorporated	$ 200.1	$ 150.3	$ 588.8	$ 388.4
Less: Earnings allocated to participating securities	(0.5)	(0.4)	(1.4)	(1.0)
Net income from continuing operations available to common shareholders	199.6	149.9	587.4	387.4
Net (loss) income from discontinued operations attributable to Hubbell Incorporated	0.0	(11.2)	0.0	52.9
Less: Earnings allocated to participating securities	0.0	0.0	0.0	(0.1)
Net (loss) income from discontinued operations available to common shareholders	0.0	(11.2)	0.0	52.8
Net income attributable to Hubbell Incorporated	200.1	139.1	588.8	441.3
Less: Earnings allocated to participating securities	(0.5)	(0.4)	(1.4)	(1.1)
Net income available to common shareholders	$ 199.6	$ 138.7	$ 587.4	$ 440.2
Denominator:
Average number of common shares outstanding (in shares)	53.6	53.7	53.6	53.8
Potential dilutive common shares (in shares)	0.4	0.3	0.4	0.3
Average number of diluted shares outstanding (in shares)	54.0	54.0	54.0	54.1
Basic earnings per share:
Basic earnings per share from continuing operations (USD per share)	$ 3.72	$ 2.79	$ 10.96	$ 7.20
Basic (loss) earnings per share from discontinued operations (USD per share)	0	(0.21)	0	0.98
Basic earnings per share (USD per share)	3.72	2.58	10.96	8.18
Diluted earnings per share:
Diluted earnings per share from continuing operations (USD per share)	3.70	2.78	10.89	7.16
Diluted (loss) earnings per share from discontinued operations (USD per share)	0	(0.21)	0	0.98
Diluted earnings per share (USD per share)	$ 3.70	$ 2.57	$ 10.89	$ 8.14