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Other Income (Expense) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Income (Expense) [Abstract]        
AFUDC - Equity $ 2.0 $ 1.0 $ 3.8 $ 2.1
Gain on Sale of Available-for-sale Securities 0.2 0 0.2 0.8
Investments and Other Expense (0.3)   (0.1)  
Investments and Other Income   0.5   1.3
Total Other Income $ 1.9 $ 1.5 $ 3.9 $ 4.2