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Bradley Agreement (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2017 and 2016 are as follows:
 
Three Months Ended
(millions) (unaudited)
March 31, 2017
 
March 31, 2016
Deficiency repayments
$
0.1

 
$
—

Interest
$
—

 
$
0.1

Premium
$
—

 
$
—

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

Deficiency payments made
0.1

Deficiency repayment received
(0.2
)
Balance at March 31, 2017
$
9.8