Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 132.6	$ 114.7	$ 304.3	$ 276.9
Other comprehensive income (loss):
Foreign currency translation adjustments	(12.2)	(0.7)	(8.9)	(21.5)
Reclassification of currency translation gains included in net income	(7.7)	0.0	(7.7)	0.0
Defined benefit pension and post-retirement plans, net of taxes	1.9	7.0	5.3	10.9
Available-for-sale investments, net of taxes	1.9	0.0	2.5	(0.4)
Unrealized gain (loss) on cash flow hedges, net of taxes	0.1	(0.9)	(1.2)	0.7
Other comprehensive (loss) income	(16.0)	5.4	(10.0)	(10.3)
Total comprehensive income	116.6	120.1	294.3	266.6
Less: Comprehensive income attributable to noncontrolling interest	1.9	1.1	5.3	4.7
Comprehensive income attributable to Hubbell	$ 114.7	$ 119.0	$ 289.0	$ 261.9