Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income attributable to Hubbell	$ 62.4us-gaap_NetIncomeLoss	$ 64.2us-gaap_NetIncomeLoss
Less: Earnings allocated to participating securities	0.2	0.2
Net income available to common shareholders	$ 62.2	$ 64.0
Denominator [Abstract]
Average number of common shares outstanding	58.0	59.0
Potential dilutive common shares	0.3	0.5
Average number of diluted shares outstanding	58.3	59.5
Basic (USD per share)	$ 1.07us-gaap_EarningsPerShareBasic	$ 1.08us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ 1.07us-gaap_EarningsPerShareDiluted	$ 1.08us-gaap_EarningsPerShareDiluted

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Net income availalbe to common shareholders under two class EPS method after reducing Net income attributable to Hubbell by earnings allocated to participating securities

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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