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Shareholders' Equity and Stock-Based Compensation (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of Accumulated Other Comprehensive income      
Balance at beginning of period $ 284.8 $ 189.8  
Other comprehensive income (loss), net 2.1 95.6 (33.9)
Balance at end of period 287.5 284.8 189.8
Pension and postretirement liability adjustment and other, tax benefit 1.0 0.8 1.1
EGS Electrical Group, LLC and Subsidiaries ("EGS")
      
Components of Accumulated Other Comprehensive income      
Pension and postretirement liability adjustment and other, tax benefit (5.0) (3.8)  
Total
      
Components of Accumulated Other Comprehensive income      
Balance at beginning of period 284.8    
Other comprehensive income (loss) before reclassifications 0.2    
Amounts reclassified from accumulated other comprehensive loss 2.5    
Other comprehensive income (loss), net 2.7 95.0 (33.8)
Balance at end of period 287.5 284.8  
Foreign Currency Translation Adjustment
      
Components of Accumulated Other Comprehensive income      
Balance at beginning of period 293.8    
Other comprehensive income (loss) before reclassifications 3.0    
Other comprehensive income (loss), net 3.0    
Balance at end of period 296.8    
Net Unrealized Losses on Qualifying Cash Flow Hedges
      
Components of Accumulated Other Comprehensive income      
Balance at beginning of period (3.3)    
Other comprehensive income (loss) before reclassifications (1.0)    
Amounts reclassified from accumulated other comprehensive loss 3.5    
Other comprehensive income (loss), net 2.5    
Balance at end of period (0.8) (3.3)  
Net unrealized gain (loss) on qualifying cash flow hedges, tax benefit (provision) 1.0 2.5  
Net Unrealized Losses on Available-for-Sale Securities
      
Components of Accumulated Other Comprehensive income      
Balance at beginning of period (3.1)    
Other comprehensive income (loss) before reclassifications (0.6)    
Other comprehensive income (loss), net (0.6)    
Balance at end of period (3.7)    
Pension and Postretirement Liability Adjustment and Other
      
Components of Accumulated Other Comprehensive income      
Balance at beginning of period (2.6)    
Other comprehensive income (loss) before reclassifications (1.2)    
Amounts reclassified from accumulated other comprehensive loss (1.0)    
Other comprehensive income (loss), net (2.2)    
Balance at end of period (4.8) (2.6)  
Pension and postretirement liability adjustment and other, tax benefit 2.2 1.2  
Pension and postretirement liability adjustment and other, tax benefit of unamortized prior service credits $ 0.2 $ 1.2