Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 110.6	$ 108.6	$ 286.3	$ 273.4
Other comprehensive (loss) income:
Foreign currency translation adjustments	(13.5)	11.6	(10.8)	(12.2)
Defined benefit pension and post-retirement plans, net of taxes of $(0.7) and $5.1	2.0	(15.7)	6.1	(12.2)
Available-for-sale investments, net of taxes of $0.1 and $0.0	(0.2)	0.1	(0.3)	0.5
Unrealized gain (loss) on cash flow hedges, net of taxes of $(0.2) and $0.2	0.8	(0.4)	1.1	0.5
Other comprehensive (loss) income	(10.9)	(4.4)	(3.9)	(23.4)
Total comprehensive income	99.7	104.2	282.4	250.0
Less: Comprehensive income attributable to noncontrolling interest	2.1	1.5	4.3	3.1
Comprehensive income attributable to Hubbell Incorporated	$ 97.6	$ 102.7	$ 278.1	$ 246.9