Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 73.8	$ 59.8
Other comprehensive income (loss):
Foreign currency translation adjustments	7.1	9.8
Defined benefit pension and post-retirement plans, net of taxes of ($0.5) and ($0.6)	1.5	2.0
Unrealized gain (loss) on investments, net of taxes of ($0.1) and $0.0	0.3	(0.3)
Unrealized gain (loss) on cash flow hedges, net of taxes of $0.2 and ($0.2)	(0.6)	0.6
Other comprehensive income	8.3	12.1
Total comprehensive income	82.1	71.9
Less: Comprehensive income attributable to noncontrolling interest	1.5	1.5
Comprehensive income attributable to Hubbell	$ 80.6	$ 70.4