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Bradley Agreement (Tables)
 12 Months Ended
Dec. 31, 2015
Contractors [Abstract]  
Schedule of deficiency payments made, net of reimbursements
The total deficiency payments, net of reimbursements, as of December 31, 2015 and 2014 are as follows:
 
December 31,
(millions)
2015
 
2014
Balance at beginning of year
$
13.3

 
$
14.6

Deficiency payments made
0.1

 
—

Deficiency repayment received
(1.8
)
 
(1.3
)
Balance at end of year
$
11.6

 
$
13.3