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Other Income (Expense) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Income (Expense) [Abstract]        
AFUDC - Equity $ 1.0 $ 1.2 $ 2.1 $ 1.9
Gain on Sale of Available-for-sale Securities 0 0 (0.8) 0
Investments and Other Income 0.5 0 1.3 0
Total Other Income $ 1.5 $ 1.2 $ 4.2 $ 1.9