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Bradley Agreement (Tables)
 6 Months Ended
Jun. 30, 2019
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 three and six months ended June 30, 2019 and 2018 are as follows:
 
Three Months Ended
 
Six Months Ended
(millions) (unaudited)
June 30, 2019
 
June 30, 2018
 
June 30, 2019
 
June 30, 2018
Deficiency repayments
$
1.8

 
$
1.4

 
$
2.4


$
2.0

Interest
$
0.5

 
$
0.5

 
$
0.5


$
0.5

Premium
$
0.2

 
$
0.1

 
$
0.2


$
0.2


The total deficiency repayments (net of payments made) to the State as of June 30, 2019 (unaudited) are as follows:
(millions)
June 30, 2019
Balance as of December 31, 2018
$
3.9

Deficiency payments made
—

Deficiency repayments received
(2.5
)
Balance as of June 30, 2019
$
1.4