Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 1,089.0	$ 991.0
Current year acquisitions	708.7	88.5
Foreign currency translation and prior year acquisitions	(13.3)	9.5
Goodwill, end of period	1,784.4	1,089.0
Electrical
Goodwill [Roll Forward]
Goodwill, beginning of period	717.6	652.0
Current year acquisitions	0.0	58.7
Foreign currency translation and prior year acquisitions	(3.5)	6.9
Goodwill, end of period	714.1	717.6
Power
Goodwill [Roll Forward]
Goodwill, beginning of period	371.4	339.0
Current year acquisitions	708.7	29.8
Foreign currency translation and prior year acquisitions	(9.8)	2.6
Goodwill, end of period	$ 1,070.3	$ 371.4

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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.

+ References

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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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