Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 405.6	$ 355.9	$ 407.4
Other comprehensive income (loss):
Foreign currency translation adjustments	(11.5)	12.3	3.7
Reclassification of currency translation gains included in net income	0.0	0.0	(7.7)
Defined benefit pension and post-retirement plans, net of taxes of $(3.2), $2.9 and $5.3	9.2	(8.8)	(14.5)
Unrealized gain (loss) on investments, net of taxes of $0.1, $(0.1) and $(0.2)	(0.4)	0.4	2.6
Unrealized gains (losses) on cash flow hedges, net of taxes of $(0.4), $0.5 and $(0.5)	1.1	(0.2)	(1.3)
Other comprehensive income (loss)	(1.6)	3.7	(17.2)
Comprehensive income	404.0	359.6	390.2
Less: Comprehensive income attributable to noncontrolling interest	6.1	4.7	6.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO HUBBELL	$ 397.9	$ 354.9	$ 383.7