Total Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	$ 3,857.9
Net income	183.0	$ 164.5
Other comprehensive income	0.6	$ 19.5
End of period	$ 3,779.2
Cash dividends declared (USD per share)	$ 1.42	$ 1.32
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	6.4	2.6
Stock-based compensation	14.4	14.4
Acquisition/surrender of common shares	(20.7)	(15.5)
Directors deferred compensation	(0.1)	(1.5)
End of period	0.0	0.0
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	4,155.7	3,779.5
Net income	181.8	163.2
Acquisition/surrender of common shares	(179.8)	(122.7)
Cash dividends declared	(75.5)	(70.8)
End of period	4,082.2	3,749.2
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	(314.8)	(386.5)
Other comprehensive income	0.6	19.5
End of period	(314.2)	(367.0)
Total Hubbell Shareholders' Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	3,847.9	3,396.2
Net income	181.8	163.2
Other comprehensive income	0.6	19.5
Stock-based compensation	14.4	14.4
Acquisition/surrender of common shares	(200.5)	(138.2)
Cash dividends declared	(75.5)	(70.8)
Directors deferred compensation	(0.1)	(1.5)
End of period	3,768.6	3,382.8
Non- controlling interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning of period	10.0	14.4
Net income	1.2	1.3
Dividends to noncontrolling interest	(0.6)	(4.9)
End of period	$ 10.6	$ 10.8