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Goodwill and Intangible (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Goodwill Roll Forward          
Goodwill, Beginning Balance     $ 727.3    
Goodwill 20.3   20.3    
Translation adjustments     (0.9)    
Goodwill, Ending Balance 746.7   746.7    
Payments To Acquire Businesses Net Of Cash Acquired     53.0 0  
Other Intangible Assets [Line Items]          
Gross Amount Finite Intangible 301.6   301.6   278.9
Gross Amount Indefinite Lived Intangible 56.1   56.1   56.1
Total Gross Other Intangible Assets 357.7   357.7   335.0
Accumulated Amortization Intangible (74.1)   (74.1)   (65.5)
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]          
Year to date amortization expense 8.8 8.3      
Remaining for year ended December 31, 2012 8.7        
Year ended December 31, 2013 17.5        
Year ended December 31, 2014 16.8        
Year ended December 31, 2015 15.2        
Year ended December 31, 2016 14.5        
Year ended December 31, 2017 13.4        
Goodwill Annual Impairment Test [Abstract]          
Excess Of Goodwill Implied Fair Value Over Carrying Value Beginning Range 75.00%   75.00%    
Excess Of Goodwill Implied Fair Value Over Carrying Value End Of Range 320.00%   320.00%    
Tradenames Other [Member]
         
Other Intangible Assets [Line Items]          
Gross Amount Indefinite Lived Intangible 56.1   56.1   56.1
Patents Tradenames Trademarks [Member]
         
Other Intangible Assets [Line Items]          
Gross Amount Finite Intangible 96.5   96.5   86.6
Accumulated Amortization Intangible (20.8)   (20.8)   (19.0)
Customer Relationships [Member]
         
Other Intangible Assets [Line Items]          
Gross Amount Finite Intangible 205.1   205.1   192.3
Accumulated Amortization Intangible (53.3)   (53.3)   (46.5)
Electrical [Member]
         
Goodwill Roll Forward          
Goodwill, Beginning Balance     453.0    
Goodwill 20.3   20.3    
Translation adjustments     0.3    
Goodwill, Ending Balance 473.6   473.6    
Power [Member]
         
Goodwill Roll Forward          
Goodwill, Beginning Balance     274.3    
Translation adjustments     (1.2)    
Goodwill, Ending Balance $ 273.1   $ 273.1