Total Equity Equity I (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Equity [Line Items]
Additional paid-in-capital	$ 76.3	$ 146.7
Retained earnings	2,021.6	1,944.1
Accumulated other comprehensive loss:
Pension and post retirement benefit plan adjustment, net of tax	(121.2)	(124.7)
Cumulative translation adjustment	(50.1)	(39.9)
Cumulative translation adjustment	0.2	0.3
Cash flow hedge gain, net of tax	0.0	0.0
Total Accumulated other comprehensive loss	(171.1)	(164.3)
Hubbell shareholders’ equity	1,927.4	1,927.1
Noncontrolling interest	9.1	8.6
Total Equity	1,936.5	1,935.7	$ 2,006.2	$ 1,914.8
Class A Common Stock
Equity [Line Items]
Common stock par value	0.1	0.1
Class B Common Stock
Equity [Line Items]
Common stock par value	$ 0.5	$ 0.5