Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Details Textual)

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Derivative Instruments and Hedging Activities (Details Textual) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2009
Agreement
Mar. 31, 2012
Dec. 31, 2009
Dec. 31, 2011
Additional Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Maximum duration of hedging of interest rate swap derivative exposure   1 year 4 months    
Number of interest rate swap agreements 4      
Interest rate swap agreements, Aggregate Notional Amounts     $ 140.0  
Average effective fixed rate on notional balances of debt and interest rate swap, minimum     4.28%  
Average effective fixed rate on notional balances of debt and interest rate swap, maximum     5.28%  
Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Outstanding notional amount of foreign currency forward contract   347.6    
Average remaining maturity of foreign currency derivative   Less than fifteen months   Less than fifteen months
Maximum [Member]
        
Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Interest on new credit facility   LIBOR + 2.50%    
Minimum [Member]
        
Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Interest on new credit facility   LIBOR + 1.50%    
Foreign exchange currency contracts [Member]
        
Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Outstanding notional amount of foreign currency forward contract   46.7   64.4
Derivative higher remaining maturity range   Next fifteen Months    
Fair Value of outstanding foreign currency forward contracts   1.5   4.4
Derivative liability Fair Value   0.2   0
Interest Rate Swap [Member]
        
Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Effective date of interest rate swap agreements     Dec. 31, 2009  
Weighted average fixed interest rate on notional amounts     2.78%  
Interest rate applicable on interest rate swap agreements for stipulated period     1 month LIBOR Rate  
Expiration date of interest rate swap agreements     Jul. 01, 2013  
Liabilities related to Interest rate swaps at fair value   $ 4.5   5.1
Freestanding Derivatives [Member]
        
Derivative Instruments and Hedging Activities (Textual) [Abstract]        
Average remaining maturity of foreign currency derivative   within 1 month   within 1 month