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Bradley Agreement (Tables)
 12 Months Ended
Dec. 31, 2020
Contractors [Abstract]  
Schedule of Deficiency Payments made, Net of Reimbursements

The total deficiency repayments (net of payments made), interest and premium received and recognized under the Bradley Agreement for the years ended December 31, 2020, 2019 and 2018 were as follows:

 

 

 

Year Ended December 31

 

(millions)

 

2020

 

 

2019

 

 

2018

 

Deficiency repayments

 

$

0.1

 

 

$

3.8

 

 

$

3.9

 

Interest

 

 

0.1

 

 

 

1.0

 

 

 

0.9

 

Premium

 

 

—

 

 

 

0.4

 

 

 

0.3