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Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Term Loan [Member]
Feb. 22, 2012
Term Loan [Member]
Jun. 30, 2012
Minimum [Member]
Term Loan [Member]
Jun. 30, 2012
Maximum [Member]
Term Loan [Member]
Jun. 30, 2012
Base rate borrowings [Member]
Minimum [Member]
Term Loan [Member]
Jun. 30, 2012
Base rate borrowings [Member]
Maximum [Member]
Term Loan [Member]
Jun. 30, 2012
LIBOR borrowings [Member]
Minimum [Member]
Term Loan [Member]
Jun. 30, 2012
LIBOR borrowings [Member]
Maximum [Member]
Term Loan [Member]
Jun. 30, 2012
13-24 [Member]
Term Loan [Member]
Jun. 30, 2012
25-36 [Member]
Term Loan [Member]
Jun. 30, 2012
Non-US lines of credit [Member]
Jun. 30, 2012
ABL Facility [Member]
Feb. 22, 2012
ABL Facility [Member]
Jun. 30, 2012
ABL Facility [Member]
Term Loan [Member]
Jun. 30, 2012
ABL Facility [Member]
Letters of credit [Member]
Jun. 30, 2012
ABL Facility [Member]
Base rate borrowings [Member]
Minimum [Member]
Jun. 30, 2012
ABL Facility [Member]
Base rate borrowings [Member]
Maximum [Member]
Jun. 30, 2012
ABL Facility [Member]
LIBOR borrowings [Member]
Minimum [Member]
Jun. 30, 2012
ABL Facility [Member]
LIBOR borrowings [Member]
Maximum [Member]
Jun. 30, 2012
ABL Facility [Member]
Non-US lines of credit [Member]
Term Loan [Member]
Jun. 30, 2012
ABL Facility [Member]
Capital lease obligations [Member]
Term Loan [Member]
Jun. 30, 2012
Secured revolving credit facility [Member]
Jun. 30, 2012
Note purchase agreement [Member]
Jun. 30, 2012
Master Note Purchase Agreement [Member]
Dec. 31, 2011
Prior Credit Agreement [Member]
Dec. 31, 2011
Prior Credit Agreement [Member]
Letters of credit [Member]
Debt (Textual) [Abstract]                                                            
Secured credit facility                             $ 13.9   $ 100.0   $ 50.0                      
Line of credit facility, term   5 years     5 years                                                  
Additional borrowing capacity                               25                            
Base rate borrowings margin ranges                 9.00% 10.00% 10.00% 11.00%               1.00% 2.75% 1.75% 3.50%              
Commitment fee                               0.50%                            
Line of credit facility, amount outstanding   18.2     10.8 215.0                 3.9                     240.0     180.0  
Maturing date of Term loan         Feb. 22, 2017                                         Apr. 25, 2012        
Date of commencement of installation         Mar. 31, 2013                                                  
Prepayment premium, description         first 12 months                                                  
Prepayment premium, interest rate                         2.75% 2.00%                                
Fixed Charge Ratio             1.00 1.50                                            
Leverage Ratio             1.00 2.00                                            
Line of credit facility, initiation date                                                   Apr. 25, 2007 Jun. 01, 2009 Jun. 01, 2003    
Remaining borrowing capacity   32.8                           28.7                         49.1 32.5
Current borrowing capacity   79.7                                                        
Maturities payment, 2012                                   4.0           3.9 0.1          
Maturities payment, 2013                                   21.7                        
Maturities payment, 2014                                   32.3                        
Maturities payment, 2015                                   32.3                        
Maturities payment, 2016                                   32.3                        
Maturities payment, thereafter                                   114.1                        
Debt (Additional Textual) [Abstract]                                                            
Breakage fees and premiums   1.0                                                        
Fair value of aggregate borrowings   236.7   221.5                                                    
Debt agreement termination costs 1.6                                                          
Debt agreement termination costs, whole interest 1.0                                                          
Write-off financing cost   0.6                                                        
Debt issuance costs   8.0                                                        
Deferred financing fees totaled   7.3   1.0                                                    
Payments of debt issuance costs   $ 6.2 $ 2.1