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Investments (Tables)
3 Months Ended
Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
  March, 31, 2013 December 31, 2012
             
  Amortized Fair Amortized Fair
  Cost Basis Value Cost Basis Value
             
             
             
Money Market Funds $ 4.4 $ 4.4 $ 1.3 $ 1.3
U.S. Equity Funds   4.0   5.7   5.4   7.4
International Equity Funds   2.0   2.3   3.4   3.8
Municipal Bond Funds   6.2   6.5   4.9   5.3
Total $ 16.6 $ 18.9 $ 15.0 $ 17.8