Investments - Amortized Cost Basis (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Available-for-sale securities, amortized cost	$ 42.5	$ 38.0
Available-for-sale securities, accumulated gross unrealized gains	0.6	0.6
Available-for-sale securities, accumulated gross unrealized losses	(0.1)	0
Available-for-sale debt securities	43.0	38.6
Trading securities, amortized cost	6.6hubb_TradingSecurityAmortizedCost	5.4hubb_TradingSecurityAmortizedCost
Trading securities, accumulated gross unrealized gains	2.3	1.9
Trading securities, accumulated gross unrealized losses	0	0
Trading securities	8.9us-gaap_TradingSecurities	7.3us-gaap_TradingSecurities
Investments, amortized cost	49.1hubb_MarketableSecuritiesAmortizedCost	43.4hubb_MarketableSecuritiesAmortizedCost
Investments, accumulated unrealized gains	2.9hubb_MarketableSecuritiesUnrealizedGain	2.5hubb_MarketableSecuritiesUnrealizedGain
TOTAL INVESTMENTS	$ 51.9us-gaap_Investments	$ 45.9us-gaap_Investments

Marketable Securities, Amortized Cost

No definition available.

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- Definition

The amount of gross unrealized gains for securities, at a point in time, which are categorized either as available for sale or trading securities.

+ References

No definition available.

+ Details

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- Definition

Trading Securities, Accumulated Gross Unrealized Gain, before Tax

+ References

No definition available.

+ Details

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- Definition

Trading Securities, Accumulated Gross Unrealized Loss, before Tax

+ References

No definition available.

+ Details

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- Definition

Trading Security, Amortized Cost

+ References

No definition available.

+ Details

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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-Topic 320

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-Paragraph 2

-Subparagraph (aa)

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Topic 320

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 2

-Subparagraph (b)-(g)

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(h))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph h

-Article 7

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- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

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