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Interest and Other Nonoperating Income (Tables)
12 Months Ended
Dec. 31, 2012
Interest and Other Income [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
   Years Ended December 31, 
 (In millions) 2012 2011 2010 
            
 Interest income$ 4.9   5.7   4.1  
 Gain on sales of available-for-sale securities  2.9   4.4   3.8  
 Other  (0.7)   (1.2)   0.1  
 Total$ 7.1   8.9   8.0