Goodwill and Other Intangible Assets Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, beginning of period	$ 800.4us-gaap_Goodwill	$ 755.5us-gaap_Goodwill
Current year acquisitions	80.9us-gaap_GoodwillAcquiredDuringPeriod	49.6us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation and prior year acquisitions	(6.6)us-gaap_GoodwillTranslationAdjustments	(4.7)us-gaap_GoodwillTranslationAdjustments
Goodwill, end of period	874.7us-gaap_Goodwill	800.4us-gaap_Goodwill
Electrical
Goodwill [Line Items]
Goodwill, beginning of period	520.9	474.6
Current year acquisitions	53.5	49.6
Foreign currency translation and prior year acquisitions	(5.5)	(3.3)
Goodwill, end of period	568.9	520.9
Power
Goodwill [Line Items]
Goodwill, beginning of period	279.5	280.9
Current year acquisitions	27.4	0
Foreign currency translation and prior year acquisitions	(1.1)	(1.4)
Goodwill, end of period	$ 305.8	$ 279.5

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 45

-Paragraph 1

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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