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The aggregate gross carrying amount (including any previously recognized impairment charges) of both major finite-lived intangible asset class and indefinite lived. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The amount of amortization expense expected to be recognized during the remainder of the current fiscal year.

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The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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Sum of the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit.

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Goodwill and Intangible (Details) (USD $) In Millions	9 Months Ended
Goodwill and Intangible (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Goodwill Roll Forward
Goodwill, Beginning Balance	$ 724.0
Translation adjustments	(1.3)
Goodwill, Ending Balance	722.7
Other Intangible Assets [Line Items]
Gross Amount Finite Intangible	265.0		266.7
Gross Amount Indefinite Lived Intangible	56.2		56.6
Total Gross Other Intangible Assets	321.2		323.3
Accumulated Amortization Intangible	(61.3)		(49.8)
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year to date amortization expense	12.4	12.3
Remaining for year ended December 31, 2011	3.6
Year ended December 31, 2012	15.4
Year ended December 31, 2013	15.0
Year ended December 31, 2014	14.5
Year ended December 31, 2015	13.2
Year ended December 31, 2016	12.5
Goodwill Annual Impairment Test [Abstract]
Disclosure Of Date Of Annual Goodwill Impairment Test	Apr. 01, 2011
Electrical [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	448.2
Translation adjustments	(0.3)
Goodwill, Ending Balance	447.9
Power [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	275.8
Translation adjustments	(1.0)
Goodwill, Ending Balance	274.8
Patents Tradenames Trademarks [Member]
Other Intangible Assets [Line Items]
Gross Amount Finite Intangible	83.3		83.6
Accumulated Amortization Intangible	(18.1)		(15.2)
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Gross Amount Finite Intangible	181.7		183.1
Accumulated Amortization Intangible	(43.2)		(34.6)
Tradenames Other [Member]
Other Intangible Assets [Line Items]
Gross Amount Indefinite Lived Intangible	$ 56.2		$ 56.6