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Bradley Agreement (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2017, 2016 and 2015 are as follows:

Year Ended December 31
(millions)
2017

2016

2015
Deficiency repayments
$
2.0


$
1.7


$
1.7

Interest
$
0.6


$
0.5


$
0.4

Premium
$
0.2


$
0.2


$
0.2

The total deficiency repayments, net of payments made, as of December 31, 2017, 2016 and 2015 are as follows:
 
December 31,
 
2017

2016

2015
Balance at beginning of year
$
9.9


$
11.6


$
13.3

Deficiency payments made
0.3


0.2


0.1

Deficiency repayment received
(2.3
)

(1.9
)

(1.8
)
Balance at end of year
$
7.8


$
9.9


$
11.6