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Investments Contractual maturies (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Amortized Cost Basis $ 0.4 $ 0.3
Available-for-sale Securities, Fair Value Disclosure 3.7  
Within one year from the balance sheet date [Member]
   
Available-for-sale Securities, Amortized Cost Basis 0  
Available-for-sale Securities, Fair Value Disclosure 0  
more than one year from balance sheet date [Member]
   
Available-for-sale Securities, Amortized Cost Basis 0.4  
Available-for-sale Securities, Fair Value Disclosure $ 3.7