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Derivative Financial Instruments (Narrative) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 5.1  
Minimum Length of Time Hedged in Cash Flow Hedge 12 months  
Maximum Length of Time Hedged in Cash Flow Hedge 24 months  
Term Loan A [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 175.0 $ 175.0
Derivative, Fixed Interest Rate Plus Applicable Spread 1.635%  
Senior Notes, Due 2020 [Member] | Fair Value Hedging [Member]    
Derivative [Line Items]    
Derivative, Notional Amount   75.0
Senior Notes, Due 2022 [Member] | Fair Value Hedging [Member]    
Derivative [Line Items]    
Derivative, Notional Amount   $ 125.0