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Bradley Agreement (Tables)
 12 Months Ended
Dec. 31, 2019
Contractors [Abstract]  
Schedule of deficiency payments made, net of reimbursements
The total deficiency payments, net of repayments received, as of December 31, 2019, 2018 and 2017 were as follows:
 
December 31,
(millions)
2019
 
2018
 
2017
Balance at beginning of year
$
3.9

 
$
7.8

 
$
9.9

Deficiency payments made
—

 
0.1

 
0.2

Deficiency repayment received
(3.8
)
 
(4.0
)
 
(2.3
)
Balance at end of year
$
0.1

 
$
3.9

 
$
7.8


The total deficiency repayments (net of payments made), interest and premium received and recorded for the years ended December 31, 2019, 2018 and 2017 were as follows:

Year Ended December 31
(millions)
2019
 
2018
 
2017
Deficiency repayments
$
3.8

 
$
3.9

 
$
2.0

Interest
1.0

 
0.9

 
0.6

Premium
0.4

 
0.3

 
0.2