Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income from continuing operations attributable to Hubbell Incorporated	$ 102.5	$ 73.3
Less: Earnings allocated to participating securities	(0.3)	(0.2)
Net income from continuing operations available to common shareholders	102.2	73.1
Net income from discontinued operations attributable to Hubbell Incorporated	77.7	4.4
Less: Earnings allocated to participating securities	(0.2)	(0.1)
Net income from discontinued operations available to common shareholders	77.5	4.3
Net income attributable to Hubbell Incorporated	180.2	77.7
Less: Earnings allocated to participating securities	(0.5)	(0.3)
Net income available to common shareholders	$ 179.7	$ 77.4
Denominator:
Average number of common shares outstanding (in shares)	54.1	54.2
Potential dilutive common shares (in shares)	0.3	0.5
Average number of diluted shares outstanding (in shares)	54.4	54.7
Basic earnings per share:
Basic earnings per share from continuing operations (USD per share)	$ 1.89	$ 1.34
Basic earnings per share from discontinued operations (USD per share)	1.43	0.09
Basic earnings per share (USD per share)	3.32	1.43
Diluted earnings per share:
Diluted earnings per share from continuing operations (USD per share)	1.88	1.33
Diluted earnings per share from discontinued operations (USD per share)	1.43	0.09
Diluted earnings per share (USD per share)	$ 3.31	$ 1.42