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Marketable Securities (Available-for-Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Available-for-Sale Securities Amortized Cost $ 19.1 $ 18.3
Available-for-Sale Securities Fair Value 18.8 17.9
US Treasury Securities [Member]
   
Available-for-Sale Securities Amortized Cost 18.3 17.5
Available-for-Sale Securities Fair Value 18.3 17.5
Asset-backed Securities [Member]
   
Available-for-Sale Securities Amortized Cost 0.8 0.8
Available-for-Sale Securities Fair Value 0.4 0.4
Equity Securities [Member]
   
Available-for-Sale Securities Amortized Cost 0 0
Available-for-Sale Securities Fair Value $ 0.1 $ 0