Goodwill and Other Intangible Assets Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 991.0	$ 928.5
Current year acquisitions	88.5	70.0
Foreign currency translation and prior year acquisitions	9.5	(7.5)
Goodwill, end of period	1,089.0	991.0
Electrical
Goodwill [Roll Forward]
Goodwill, beginning of period	652.0	611.2
Current year acquisitions	58.7	49.4
Foreign currency translation and prior year acquisitions	6.9	(8.6)
Goodwill, end of period	717.6	652.0
Power
Goodwill [Roll Forward]
Goodwill, beginning of period	339.0	317.3
Current year acquisitions	29.8	20.6
Foreign currency translation and prior year acquisitions	2.6	1.1
Goodwill, end of period	$ 371.4	$ 339.0

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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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.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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