Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,492.7	$ 1,502.4	$ 1,484.3	$ 1,365.2	$ 1,334.3	$ 1,442.6	$ 1,452.5	$ 1,399.1	$ 5,844.6	$ 5,628.5	$ 5,372.9
Cost of goods sold	967.6	958.1	932.2	922.6	882.1	936.6	938.7	965.5	3,780.5	3,722.9	3,495.9
Gross profit	525.1	544.3	552.1	442.6	452.2	506.0	513.8	433.6	2,064.1	1,905.6	1,877.0
Selling & administrative expenses	213.6	213.7	215.8	212.2	192.5	193.3	207.5	219.2	855.3	812.5	849.6
Net income	225.2	256.7	245.5	164.5	199.4	227.8	219.1	138.4	891.9	784.7	757.6
Net income attributable to Hubbell Incorporated	$ 224.2	$ 255.5	$ 244.2	$ 163.2	$ 198.2	$ 226.2	$ 217.5	$ 137.1	$ 887.1	$ 779.0	$ 751.4
Basic earnings per share (USD per share)	$ 4.21	$ 4.80	$ 4.58	$ 3.04	$ 3.69	$ 4.21	$ 4.04	$ 2.55	$ 16.63	$ 14.49	$ 13.98
Diluted earnings per share (USD per share)	$ 4.19	$ 4.77	$ 4.56	$ 3.03	$ 3.66	$ 4.18	$ 4.01	$ 2.53	$ 16.54	$ 14.39	$ 13.89