Total Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	$ 2,370.6
Net income	183.4	$ 181.5
Other comprehensive (loss) income	9.3	$ 5.4
End of period	$ 2,483.1
Cash dividends declared (USD per share)	$ 1.12	$ 1.05
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	$ 0.6	$ 0.6
End of period	0.6	0.6
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	0.0	0.0
Stock-based compensation	11.7	11.1
Acquisition/surrender of common shares	(9.9)	(11.2)
Directors deferred compensation		0.1
End of period	1.8	0.0
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	2,705.5	2,560.0
Net income	181.9	180.2
Acquisition/surrender of common shares	(21.2)	(145.2)
Cash dividends declared	(60.0)	(56.9)
End of period	2,806.2	2,538.1
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	(345.2)	(330.8)
Other comprehensive (loss) income	9.3	5.4
End of period	(335.9)	(325.4)
Total Hubbell Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	2,360.9	2,229.8
Net income	181.9	180.2
Other comprehensive (loss) income	9.3	5.4
Stock-based compensation	11.7	11.1
Acquisition/surrender of common shares	(31.1)	(156.4)
Cash dividends declared	(60.0)	(56.9)
Directors deferred compensation		0.1
End of period	2,472.7	2,213.3
Non- controlling interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	9.7	10.9
Net income	1.5	1.3
Dividends to noncontrolling interest	(0.8)	(1.1)
End of period	$ 10.4	$ 11.1