Other, Net
 9 Months Ended
Sep. 30, 2016
Other Nonoperating Income (Expense) [Abstract]  
Other, Net
Other, Net
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in millions)
2016
 
2015
 
2016
 
2015
AFUDC Equity
$
13.8

 
$
6.6

 
$
29.7

 
$
15.0

Miscellaneous
0.5

 
2.8

 
0.6

 
3.6

Total Other, net
$
14.3

 
$
9.4

 
$
30.3

 
$
18.6