Goodwill and Other Intangible Assets, net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2014	$ 874.7
Current Year Acquisitions	42.3
Foreign Currency Translation and Prior Year Acquisitions	(0.5)
BALANCE MARCH 31, 2015	916.5
Electrical
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2014	568.9
Current Year Acquisitions	29.8
Foreign Currency Translation and Prior Year Acquisitions	0.8
BALANCE MARCH 31, 2015	599.5
Power
Goodwill [Roll Forward]
BALANCE DECEMBER 31, 2014	305.8
Current Year Acquisitions	12.5
Foreign Currency Translation and Prior Year Acquisitions	(1.3)
BALANCE MARCH 31, 2015	$ 317.0