Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 108.6	$ 132.6	$ 273.4	$ 304.3
Currency translation adjustment:
Foreign currency translation adjustments	11.6	(12.2)	(12.2)	(8.9)
Reclassification of currency translation gains included in net income	0.0	(7.7)	0.0	(7.7)
Defined benefit pension and post-retirement plans, net of taxes of $5.1, $(0.7), $4.0 and $(1.8)	(15.7)	1.9	(12.2)	5.3
Available-for-sale investments, net of taxes of $0.0, $0.0, $(0.1) and $(0.2)	0.1	1.9	0.5	2.5
Unrealized gain (loss) on cash flow hedges, net of taxes of $0.2, $(0.1), $(0.1), and $0.4	(0.4)	0.1	0.5	(1.2)
Other comprehensive (loss) income	(4.4)	(16.0)	(23.4)	(10.0)
Total comprehensive income	104.2	116.6	250.0	294.3
Less: Comprehensive income attributable to noncontrolling interest	1.5	1.9	3.1	5.3
Comprehensive income attributable to Hubbell Incorporated	$ 102.7	$ 114.7	$ 246.9	$ 289.0