Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income attributable to Hubbell	$ 60.9	$ 62.4
Less: Earnings allocated to participating securities	(0.2)	(0.2)
Net income available to common shareholders	$ 60.7	$ 62.2
Denominator [Abstract]
Average number of common shares outstanding (shares)	56.3	58.0
Potential dilutive common shares (shares)	0.2	0.3
Average number of diluted shares outstanding (shares)	56.5	58.3
Basic (USD per share)	$ 1.08	$ 1.07
Diluted (USD per share)	$ 1.08	$ 1.07