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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended
Sep. 30, 2014
Jul. 09, 2014
Jul. 09, 2014
Revolving credit facility [Member]
Aug. 09, 2013
Revolving credit facility [Member]
Aug. 03, 2012
Revolving credit facility [Member]
Sep. 30, 2014
Eurocurrency [Member]
Sep. 30, 2014
Base Rate [Member]
Jul. 09, 2014
Term Loan Facility Maturing [Member]
Aug. 09, 2013
Term Loan Facility Maturing [Member]
Aug. 03, 2012
Term Loan Facility Maturing [Member]
Line of Credit Facility [Line Items]                    
Revolving credit facility       $ 200.0 $ 125.0          
Term loan               200.0 175.0 170.0
Line of Credit Facility, Current Borrowing Capacity     350.0              
Debt Instrument Maturities Quarterly Repayments of Principal   2.5                
Debt Instrument, Maturity Date Jul. 09, 2019                  
Interest rate applicable margin range, Minimum           2.00% 1.00%      
Interest Rate applicable margin range, Maximum           3.00% 2.00%      
Issuance in letters of credit 18.6                  
Outstanding letters of credit 30.0                  
Total availability under revolving credit facility $ 85.3                  
Average interest rate on credit agreement 2.90%