Condensed Consolidated Statements of Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,191.8	$ 949.2	$ 2,270.2	$ 2,039.5
Cost of goods sold	861.0	668.7	1,649.6	1,445.5
Gross profit	330.8	280.5	620.6	594.0
Selling & administrative expenses	178.1	149.0	350.3	343.7
Operating income	152.7	131.5	270.3	250.3
Interest expense, net	(12.7)	(15.7)	(27.9)	(30.8)
Loss on disposition of business	(6.8)	0.0	(6.8)	0.0
Loss on extinguishment of debt	(16.8)	0.0	(16.8)	0.0
Other expense, net	(1.0)	(2.8)	(1.9)	(6.6)
Total other expense	(37.3)	(18.5)	(53.4)	(37.4)
Income before income taxes	115.4	113.0	216.9	212.9
Provision for income taxes	18.8	23.9	41.2	48.1
Net income	96.6	89.1	175.7	164.8
Less: Net income attributable to noncontrolling interest	0.8	0.9	2.2	1.6
Net income attributable to Hubbell Incorporated	$ 95.8	$ 88.2	$ 173.5	$ 163.2
Earnings per share
Basic (USD per share)	$ 1.76	$ 1.62	$ 3.19	$ 3.00
Diluted (USD per share)	1.74	1.62	3.16	2.99
Cash dividends per common share (USD per share)	$ 0.98	$ 0.91	$ 1.96	$ 1.82