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Investments (Tables)
6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
  June 30, 2013 December 31, 2012
             
  Amortized Fair Amortized Fair
  Cost Basis Value Cost Basis Value
             
             
             
Cash and Money Market Funds $ 11.7 $ 11.7 $ 1.3 $ 1.3
U.S. Equity Funds   4.1   5.8   5.4   7.4
International Equity Funds   3.0   3.1   3.4   3.8
Municipal Bond Funds   7.3   7.4   4.9   5.3
Total $ 26.1 $ 28.0 $ 15.0 $ 17.8