Other, Net (Schedule of Other, Net) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Other Nonoperating Income (Expense) [Abstract]    
AFUDC Equity $ 6.1 $ 3.5
Miscellaneous 0.0 0.8
Total Other, net $ 6.1 $ 4.3