Consolidated Statement of Changes in Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Total Hubbell Shareholders' Equity	Total Hubbell Shareholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Non- controlling interest
Accounting Standards Update [Extensible List]		Accounting Standards Update 2016-13 [Member]
Beginning of period at Dec. 31, 2018			$ 0.6	$ 1.3	$ 2,064.4		$ (285.7)	$ 1,780.6		$ 18.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 407.4			400.9			400.9		6.5
Other comprehensive (loss) income		(17.2)					(17.2)	(17.2)
Stock-based compensation				16.4				16.4
Reclassification of stranded tax effects		(30.0)			30.0		(30.0)
Acquisition and surrender of common shares	[1]			(18.3)	(28.9)			(47.2)
Cash dividends declared					(187.0)			(187.0)
Dividends to noncontrolling interest										(11.4)
Directors deferred compensation				0.6				0.6
End of period at Dec. 31, 2019			0.6	0.0	2,279.4	$ (1.0)	(332.9)	1,947.1	$ (1.0)	13.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		355.9			351.2			351.2		4.7
Other comprehensive (loss) income		3.7					3.7	3.7
Stock-based compensation				23.9				23.9
Acquisition and surrender of common shares	[1]			(17.8)	(34.1)			(51.9)
Cash dividends declared					(201.8)			(201.8)
Dividends to noncontrolling interest										(2.7)
Directors deferred compensation				(1.2)				(1.2)
End of period at Dec. 31, 2020		2,085.4	0.6	4.9	2,393.7		(329.2)	2,070.0		15.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		405.6			399.5			399.5		6.1
Other comprehensive (loss) income		(1.6)					(1.6)	(1.6)
Stock-based compensation				18.6				18.6
Acquisition and surrender of common shares	[1]			(24.2)	(15.8)			(40.0)
Cash dividends declared					(217.4)			(217.4)
Dividends to noncontrolling interest										(10.6)
Directors deferred compensation				0.7				0.7
End of period at Dec. 31, 2021		$ 2,240.7	$ 0.6	$ 0.0	$ 2,560.0		$ (330.8)	$ 2,229.8		$ 10.9

[1] For accounting purposes, the Company treats repurchased shares as constructively retired when acquired and accordingly charges the purchase price against Common Stock par value, Additional paid-in capital, to the extent available, and Retained earnings. The change in Retained earnings of $15.8 million, $34.1 million and $28.9 million in 2021, 2020 and 2019, respectively, reflects this accounting treatment.