Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Net Sales	$ 709.2	$ 646.4	$ 1,367.3	$ 1,216.9
Operating Income	105.1	93.5	188.7	159.2
Operating Income as a % of Net Sales	14.80%	14.50%	13.80%	13.10%
Electrical [Member]
Segment Reporting Information [Line Items]
Net Sales	497.9	458.4	964.0	867.7
Operating Income	69.2	61.1	126.8	101.2
Operating Income as a % of Net Sales	13.90%	13.30%	13.20%	11.70%
Power [Member]
Segment Reporting Information [Line Items]
Net Sales	211.3	188.0	403.3	349.2
Operating Income	$ 35.9	$ 32.4	$ 61.9	$ 58.0
Operating Income as a % of Net Sales	17.00%	17.20%	15.30%	16.60%

Percentage of net result for the period of deducting operating expenses from operating revenues to aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process).

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ Details

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 1

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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