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Bradley Agreement (Tables)
 6 Months Ended
Jun. 30, 2018
Contractors [Abstract]  
Schedule of Deficiency Payments Made, Net of Reimbursements
The total deficiency repayments (net of payments made) to the State as of June 30, 2018 (unaudited) are as follows:
(millions)
2018
Balance as of December 31, 2017
$
7.8

Deficiency payments made
0.1

Deficiency repayments received
(2.1
)
Balance as of June 30, 2018
$
5.8

The total deficiency repayments (net of payments made), interest and premium received and recorded for the three and six months ended June 30, 2018 and 2017 are as follows:
 
Three Months Ended
 
Six Months Ended
(millions) (unaudited)
June 30, 2018
 
June 30, 2017
 
June 30, 2018

June 30, 2017
Deficiency repayments
$
1.4

 
$
1.1

 
$
2.0


$
1.2

Interest
$
0.5

 
$
0.2

 
$
0.5


$
0.2

Premium
$
0.1

 
$
0.1

 
$
0.2


$
0.1