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Bradley Agreement (Tables)
6 Months Ended
Jun. 30, 2017
Contractors [Abstract]  
Schedule of deficiency payments made, net of reimbursements
The total deficiency repayments (net of payments made), interest and premium received and recorded for the six months ended June 30, 2017 and 2016 were as follows:
 
Three Months Ended
 
Six Months Ended
(millions) (unaudited)
June 30, 2017

June 30, 2016
 
June 30, 2017

June 30, 2016
Deficiency repayments
$
1.1


$
1.1

 
$
1.2


$
1.2

Interest
$
0.2


$

 
$
0.2


$
0.1

Premium
$
0.1


$
0.1

 
$
0.1


$
0.1

The total deficiency repayments (net of payments made) to the State as of June 30, 2017 (unaudited) were as follows:
(millions)
2017
Balance at December 31, 2016
$
9.9

Deficiency payments made
0.1

Deficiency repayment received
(1.3
)
Balance at June 30, 2017
$
8.7