Annual report pursuant to Section 13 and 15(d)

Debt (Details)

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Debt (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Jun. 30, 2016  
Financing costs   $ 1.7
Amortization period of debt issuance costs   5Y
Debt outstanding 140.2 164.2
Duration of interest rate cash flow hedge 3 years  
Amount of interest rate hedge 101  
Interest rate range, minimum (in hundredths) 2.21%  
Interest rate range, maximum (in hundredths) 3.62%  
Interest expense, net 5.2 3.1
LIBOR [Member]
   
Debt Instrument [Line Items]    
Base margin (in hundredths) 2.00%  
Base Rate [Member]
   
Debt Instrument [Line Items]    
Base margin (in hundredths) 0.25%  
Term loan [Member]
   
Debt Instrument [Line Items]    
Borrowings outstanding 92.2 110.9
Term loan payments 2013 23.4  
Term loan payments 2014 25  
Term loan payments 2015 34.3  
Term loan payments 2016 9.4  
Letters of Credit [Member]
   
Debt Instrument [Line Items]    
Letters of credit outstanding 1.3 5.0
Revolving Loans [Member]
   
Debt Instrument [Line Items]    
Revolving loans maximum borrowing capacity 125  
Revolving loans potential increment in maximum borrowing capacity 175  
Revolving loans amount outstanding $ 48.0 $ 53.3