Goodwill and Intangible Assets, net - Changes in Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2017	$ 1,089.0
Current year acquisitions (Note 3 – Business Acquisitions)	685.1
Foreign currency translation and prior year acquisitions	(7.7)
BALANCE SEPTEMBER 30, 2018	1,766.4
Electrical
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2017	717.6
Current year acquisitions (Note 3 – Business Acquisitions)	0.0
Foreign currency translation and prior year acquisitions	(1.1)
BALANCE SEPTEMBER 30, 2018	716.5
Power
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2017	371.4
Current year acquisitions (Note 3 – Business Acquisitions)	685.1
Foreign currency translation and prior year acquisitions	(6.6)
BALANCE SEPTEMBER 30, 2018	$ 1,049.9

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.

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