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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Level 1
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cash equivalents $ 5.5 $ 5.9
Level 2
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Fair value of long-term debt $ 254.0