Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 79.1	$ 75.7
Other comprehensive (loss) income:
Foreign currency translation adjustments	(6.6)	(25.6)
Defined benefit pension and post-retirement plans, net of taxes of $(0.7) and $(0.6)	2.0	1.7
Available-for-sale investments, net of taxes of $0.0 and $0.0	(0.1)	(0.1)
Unrealized gain (loss) on cash flow hedges, net of taxes of $0.0 and $(0.6)	0.1	1.6
Other comprehensive (loss) income	(4.6)	(22.4)
Total comprehensive income	74.5	53.3
Less: Comprehensive income attributable to noncontrolling interest	1.4	0.7
Comprehensive income attributable to Hubbell Incorporated	$ 73.1	$ 52.6