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Other Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Other Income (Expense) [Abstract]        
AFUDC–Equity $ 1.0 $ 2.1 $ 2.6 $ 5.9
Gain on Sale of Available-for-sale Securities 0.0 0.0 0.1 0.2
Investments and Other Income 0.7   0.8  
Investments and Other Expense   0.0   (0.1)
Total Other Income $ 1.7 $ 2.1 $ 3.5 $ 6.0