Goodwill and Intangible Assets, net (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2014	$ 874.7
Current year acquisitions	40.7
Foreign currency translation and prior year acquisitions	4.8
BALANCE JUNE 30, 2015	920.2
Electrical
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2014	568.9
Current year acquisitions	28.9
Foreign currency translation and prior year acquisitions	3.6
BALANCE JUNE 30, 2015	601.4
Power
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2014	305.8
Current year acquisitions	11.8
Foreign currency translation and prior year acquisitions	1.2
BALANCE JUNE 30, 2015	$ 318.8