Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income attributable to Hubbell	$ 80.1	$ 90.2	$ 142.5	$ 154.4
Less: Earnings allocated to participating securities	0.2	0.3	0.4	0.5
Net income available to common shareholders	$ 79.9	$ 89.9	$ 142.1	$ 153.9
Denominator [Abstract]
Average number of common shares outstanding	57.7	59.0	57.9	59.0
Potential dilutive common shares	0.3	0.4	0.3	0.5
Average number of diluted shares outstanding	58.0	59.4	58.2	59.5
Basic (USD per share)	$ 1.39	$ 1.53	$ 2.46	$ 2.61
Diluted (USD per share)	$ 1.37	$ 1.51	$ 2.44	$ 2.59