Total Equity - Schedule of Stockholders Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	$ 2,889.3
Net income	149.1	$ 183.4
Other comprehensive (loss) income	(9.3)	$ 9.3
End of period	$ 2,943.1
Cash dividends declared (USD per share)	$ 1.22	$ 1.12
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	6.1	0.0
Stock-based compensation	12.8	11.7
Acquisition/surrender of common shares	(17.6)	(9.9)
End of period	1.3	1.8
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	3,182.7	2,705.5
Net income	147.8	181.9
Acquisition/surrender of common shares	(14.6)	(21.2)
Cash dividends declared	(65.7)	(60.0)
End of period	3,250.2	2,806.2
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	(312.4)	(345.2)
Other comprehensive (loss) income	(9.3)	9.3
End of period	(321.7)	(335.9)
Total Hubbell Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	2,877.0	2,360.9
Net income	147.8	181.9
Other comprehensive (loss) income	(9.3)	9.3
Stock-based compensation	12.8	11.7
Acquisition/surrender of common shares	(32.2)	(31.1)
Cash dividends declared	(65.7)	(60.0)
Directors deferred compensation	0.0	0.0
End of period	2,930.4	2,472.7
Non- controlling interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	12.3	9.7
Net income	1.3	1.5
Dividends to noncontrolling interest	(0.9)	(0.8)
End of period	$ 12.7	$ 10.4