Total Equity - Schedule of Stockholders Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period			$ 2,370.6		$ 2,370.6
Net income	$ 202.0	$ 140.8			593.6	$ 445.8
Other comprehensive (loss) income	(10.8)	$ (23.0)			5.0	$ (43.4)
End of period	$ 2,750.5				$ 2,750.5
Cash dividends declared (USD per share)	$ 1.12	$ 1.05	$ 2.24	$ 2.10	$ 3.36	$ 3.15
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	$ 0.6	$ 0.6	$ 0.6	$ 0.6	$ 0.6	$ 0.6
End of period	0.6	0.6	0.6	0.6	0.6	0.6
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	0.0	3.9	0.0	0.0	0.0	0.0
Stock-based compensation	5.5	5.0	16.1	16.7
Acquisition/surrender of common shares	(4.3)	(0.9)	(16.3)	(13.1)
Directors deferred compensation	0.2	(1.9)	0.2	0.3
End of period	1.4	6.1	0.0	3.9	1.4	6.1
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	2,949.5	2,603.6	2,705.5	2,560.0	2,705.5	2,560.0
Net income	200.1	139.1	388.7	302.2
Acquisition/surrender of common shares	(12.1)		(24.5)	(145.2)	(36.6)	(145.2)
Cash dividends declared	(60.2)	(56.5)	(120.2)	(113.4)
End of period	3,077.3	2,686.2	2,949.5	2,603.6	3,077.3	2,686.2
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	(329.4)	(351.2)	(345.2)	(330.8)	(345.2)	(330.8)
Other comprehensive (loss) income	(10.8)	(23.0)	15.8	(20.4)
End of period	(340.2)	(374.2)	(329.4)	(351.2)	(340.2)	(374.2)
Total Hubbell Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	2,620.7	2,256.9	2,360.9	2,229.8	2,360.9	2,229.8
Net income	200.1	139.1	388.7	302.2
Other comprehensive (loss) income	(10.8)	(23.0)	15.8	(20.4)
Stock-based compensation	5.5	5.0	16.1	16.7
Acquisition/surrender of common shares	(16.4)	(0.9)	(40.8)	(158.3)
Cash dividends declared	(60.2)	(56.5)	(120.2)	(113.4)
Directors deferred compensation	0.2	(1.9)	0.2	0.3
End of period	2,739.1	2,318.7	2,620.7	2,256.9	2,739.1	2,318.7
Non- controlling interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	10.4	11.0	9.7	10.9	9.7	10.9
Net income	1.9	1.7	2.9	2.8
Dividends to noncontrolling interest	(0.9)	(1.2)	(2.2)	(2.7)
End of period	$ 11.4	$ 11.5	$ 10.4	$ 11.0	$ 11.4	$ 11.5