Earnings Per Share - Schedule of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income attributable to Hubbell Incorporated	$ 147.8	$ 181.9
Less: Earnings allocated to participating securities	(0.3)	(0.4)
Net income available to common shareholders	$ 147.5	$ 181.5
Denominator:
Average number of common shares outstanding (in shares)	53.7	53.6
Potential dilutive common shares (in shares)	0.3	0.3
Average number of diluted shares outstanding (in shares)	54.0	53.9
Earnings per share:
Basic earnings per share (USD per share)	$ 2.75	$ 3.39
Diluted earnings per share (USD per share)	$ 2.73	$ 3.37