Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 96.6	$ 89.1	$ 175.7	$ 164.8
Other comprehensive (loss) income:
Foreign currency translation adjustments	9.3	1.8	2.7	(23.8)
Defined benefit pension and post-retirement plans, net of taxes of $(0.7) and $(0.5)	2.1	1.8	4.1	3.5
Available-for-sale investments, net of taxes of $0.0 and $(0.1)	0.0	0.5	(0.1)	0.4
Unrealized gain (loss) on cash flow hedges, net of taxes of $(0.1) and $0.3	0.2	(0.7)	0.3	0.9
Other comprehensive (loss) income	11.6	3.4	7.0	(19.0)
Total comprehensive income	108.2	92.5	182.7	145.8
Less: Comprehensive income attributable to noncontrolling interest	0.8	0.9	2.2	1.6
Comprehensive income attributable to Hubbell Incorporated	$ 107.4	$ 91.6	$ 180.5	$ 144.2