Goodwill and Intangible (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Goodwill Roll Forward
Goodwill, Beginning Balance	$ 727.3
Business Acquisition, Purchase Price Allocation, Goodwill Amount	4.5
Translation adjustments	2.9
Goodwill, Ending Balance	734.7
Payments To Acquire Businesses Net Of Cash Acquired	10.9	0
Other Intangible Assets [Line Items]
Gross Amount Finite Intangible	285.0		278.9
Gross Amount Indefinite Lived Intangible	56.5		56.1
Total Gross Other Intangible Assets	341.5		335.0
Accumulated Amortization Intangible	(70.1)		(65.5)
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Year to date amortization expense	4.2	4.1
Remaining for year ended December 31, 2012	12.4
Year ended December 31, 2013	16.2
Year ended December 31, 2014	15.6
Year ended December 31, 2015	14.1
Year ended December 31, 2016	13.4
Year ended December 31, 2017	12.3
Tradenames Other [Member]
Other Intangible Assets [Line Items]
Gross Amount Indefinite Lived Intangible	56.5		56.1
Patents Tradenames Trademarks [Member]
Other Intangible Assets [Line Items]
Gross Amount Finite Intangible	88.8		86.6
Accumulated Amortization Intangible	(19.8)		(19.0)
Customer Relationships [Member]
Other Intangible Assets [Line Items]
Gross Amount Finite Intangible	196.2		192.3
Accumulated Amortization Intangible	(50.3)		(46.5)
Electrical [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	453.0
Business Acquisition, Purchase Price Allocation, Goodwill Amount	4.5
Translation adjustments	2.5
Goodwill, Ending Balance	460.0
Power [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	274.3
Translation adjustments	0.4
Goodwill, Ending Balance	$ 274.7