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Derivative Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2011
Interest Rate Risk [Abstract]      
Term of interest rate swap 4 years    
LIBOR-based interest rate LIBOR-based interest rate to 1.25%    
Variable interest rate (in hundredths)     1.25%
Senior credit facility balance covered under interest rate swap contracts   $ 150.0 $ 250.0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 0.8    
Derivatives, Fair Value [Line Items]      
Derivative Asset, Fair Value, Gross Asset 3.2 2.3  
Foreign Exchange Forward [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 51.8    
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Accrued Expenses And Other Current Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative liability 1.5 1.4  
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Non-current Liabilities [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative liability 0.4 0.9  
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative liability 1.2 0  
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative Asset, Fair Value, Gross Asset $ 0.1 $ 0