Condensed Consolidated Statements of Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 1,078.4	$ 1,090.3
Cost of goods sold	788.6	776.8
Gross profit	289.8	313.5
Selling & administrative expenses	172.2	194.7
Operating income	117.6	118.8
Interest expense, net	(15.2)	(15.1)
Other expense, net	(0.9)	(3.8)
Total other expense	(16.1)	(18.9)
Income before income taxes	101.5	99.9
Provision for income taxes	22.4	24.2
Net income	79.1	75.7
Less: Net income attributable to noncontrolling interest	1.4	0.7
Net income attributable to Hubbell Incorporated	$ 77.7	$ 75.0
Earnings per share
Basic (USD per share)	$ 1.43	$ 1.38
Diluted (USD per share)	1.42	1.37
Cash dividends per common share (USD per share)	$ 0.98	$ 0.91