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Other Income (Expense) (Tables)
 3 Months Ended
Mar. 31, 2013
Other Income (Expense) [Abstract]  
Other Income (Expense) [Table Text Block]
 
 
Quarter Ended
 
 
March 31,
 
 
2013
 
2012
Millions
 
 
 
 
AFUDC – Equity
 

$1.1

 

$0.8

Gain on Sale of Available-for-sale Securities
 
0.8

 
—

Investments and Other Income (Expense)
 
0.8

 
(0.1
)
Total Other Income
 

$2.7

 

$0.7