Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 766.0	$ 551.4	$ 405.6
Currency translation adjustment:
Foreign currency translation adjustments	22.9	(27.9)	(11.5)
Reclassification of currency translation gains included in net income	0.0	0.5	0.0
Defined benefit pension and post-retirement plans, net of taxes of $(4.2), $(4.8) and $(3.2)	10.2	14.2	9.2
Unrealized gain (loss) on investments, net of taxes of $(0.2), $0.4 and $0.1	0.6	(1.4)	(0.4)
Unrealized gains (losses) on cash flow hedges, net of taxes of $0.4, $(0.1) and $(0.4)	(0.9)	0.2	1.1
Other comprehensive income (loss)	32.8	(14.4)	(1.6)
Comprehensive income	798.8	537.0	404.0
Less: Comprehensive income attributable to noncontrolling interest	6.2	5.5	6.1
COMPREHENSIVE INCOME ATTRIBUTABLE TO HUBBELL	$ 792.6	$ 531.5	$ 397.9