Equity II (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning of period			$ 1,914.8	$ 1,667.9
Total comprehensive income	67.5	109.2	236.8	241.7
Stock-based compensation			9.4	7.8
Stock Options Exercised			1.1	1.5
Income tax windfall from stock-based awards, net			7.8	6.5
Acquisition and surrender of common shares			(45.0)	(40.4)
Issuance of shares related to director's deferred compensation			0.5	0.1
Dividends to noncontrolling interest			(1.7)	(1.1)
Cash dividends declared			(88.7)	(80.1)
Equity, end of period	2,035.0	1,803.9	2,035.0	1,803.9
Hubbell Shareholders Equity [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning of period			1,906.4	1,661.2
Total comprehensive income			234.2	239.2
Stock-based compensation			9.4	7.8
Stock Options Exercised			1.1	1.5
Income tax windfall from stock-based awards, net			7.8	6.5
Acquisition and surrender of common shares			(45.0)	(40.4)
Issuance of shares related to director's deferred compensation			0.5	0.1
Dividends to noncontrolling interest			0	0
Cash dividends declared			(88.7)	(80.1)
Equity, end of period	2,025.7	1,795.8	2,025.7	1,795.8
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, beginning of period			8.4	6.7
Total comprehensive income			2.6	2.5
Stock-based compensation			0	0
Stock Options Exercised			0	0
Income tax windfall from stock-based awards, net			0	0
Acquisition and surrender of common shares			0	0
Issuance of shares related to director's deferred compensation			0	0
Dividends to noncontrolling interest			(1.7)	(1.1)
Cash dividends declared			0	0
Equity, end of period	$ 9.3	$ 8.1	$ 9.3	$ 8.1