Goodwill and Intangible Assets, net - Changes in Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2016	$ 991.0
Current year acquisitions (Note 2 – Business Acquisitions)	61.9
Foreign currency translation and prior year acquisitions	10.6
BALANCE SEPTEMBER 30, 2017	1,063.5
Electrical
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2016	652.0
Current year acquisitions (Note 2 – Business Acquisitions)	57.4
Foreign currency translation and prior year acquisitions	7.6
BALANCE SEPTEMBER 30, 2017	717.0
Power
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2016	339.0
Current year acquisitions (Note 2 – Business Acquisitions)	4.5
Foreign currency translation and prior year acquisitions	3.0
BALANCE SEPTEMBER 30, 2017	$ 346.5

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
-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
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-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-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
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-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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