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Bradley Agreement (Tables)
 12 Months Ended
Dec. 31, 2018
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 years ended December 31, 2018, 2017 and 2016 are as follows:

Year Ended December 31
(millions)
2018

2017

2016
Deficiency repayments
$
3.9


$
2.0


$
1.7

Interest
0.9


0.6


0.5

Premium
$
0.3


$
0.2


$
0.2

The total deficiency repayments, net of payments made, as of December 31, 2018, 2017 and 2016 are as follows:
 
December 31,
(millions)
2018

2017

2016
Balance at beginning of year
$
7.8


$
9.9


$
11.6

Deficiency payments made
0.1


0.3


0.2

Deficiency repayment received
(4.0
)

(2.3
)

(1.9
)
Balance at end of year
$
3.9


$
7.8


$
9.9