Business Acquisitions - Summary of Pro Forma Information (Details) - Aclara - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Net sales	$ 1,167.5	$ 1,078.3	$ 2,205.4	$ 2,037.5
Net income attributable to Hubbell	$ 99.5	$ 76.8	$ 167.2	$ 116.3
Earnings Per Share:
Basic (USD per share)	$ 1.81	$ 1.40	$ 3.04	$ 2.11
Diluted (USD per share)	$ 1.81	$ 1.39	$ 3.03	$ 2.09