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Derivatives - Derivative (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Interest Rate Swap [Member]
    
Derivative [Line Items]    
Interest Rate Swap Variable Rate Basis one-month LIBOR  
Interest Rate Cash Flow Hedge Effectiveness Assessment and Measurement Cash flows from the Swaps are expected to be highly effective. If it is determined the Swaps cease to be effective, we will prospectively discontinue hedge accounting. When applicable, we use the shortcut method to assess hedge effectiveness. If the shortcut method is not applicable, we assess effectiveness using the “change-in-variable-cash-flows” method. Our assessments of hedge effectiveness resulted in no ineffectiveness recorded for the quarter and six months ended June 30, 2014.  
Interest Rate Swap Liability $ 0.5 $ 0.6
Interest Rate Swap Liability, Other Non-Current Liabilities 0.4 0.3
Interest Rate Swap Liability, Other Current Liabilities $ 0.1 $ 0.3
Interest Rate Swap Member Effective August 25, 2011 [Member]
    
Derivative [Line Items]    
Interest Rate Swap Fixed Interest Rate 0.825%  
Interest Rate Swap Member Effective August 25, 2014 [Member]
    
Derivative [Line Items]    
Interest Rate Swap Fixed Interest Rate 0.75%