Goodwill and Intangible Assets, net - Changes in Goodwill (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2017	$ 1,089.0
Current year acquisitions (Note 3 – Business Acquisitions)	679.0
Foreign currency translation and prior year acquisitions	(8.3)
BALANCE JUNE 30, 2018	1,759.7
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	(1.2)
BALANCE JUNE 30, 2018	716.4
Power
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2017	371.4
Current year acquisitions (Note 3 – Business Acquisitions)	679.0
Foreign currency translation and prior year acquisitions	(7.1)
BALANCE JUNE 30, 2018	$ 1,043.3

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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