Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 59.8	$ 63.9
Other comprehensive income (loss):
Foreign currency translation adjustments	9.8	11.5
Pension and post retirement benefit plans’ prior service costs and net actuarial gains, net of taxes	2.0	1.7
Unrealized gain (loss) on investments, net of taxes	(0.3)	0.4
Unrealized gain (loss) on cash flow hedges, net of taxes	0.6	(0.1)
Other comprehensive income	12.1	13.5
Total comprehensive income	71.9	77.4
Less: Comprehensive income attributable to noncontrolling interest	1.5	1.1
Comprehensive income attributable to Hubbell	$ 70.4	$ 76.3