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Bradley Agreement (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014 are as follows:

Year Ended December 31
(millions)
2016

2015

2014
Deficiency repayments
$
1.7


$
1.8


$
1.3

Interest
$
0.5


$
0.4


$
0.5

Premium
$
0.2


$
0.2


$
0.1

The total deficiency repayments, net of payments, as of December 31, 2016, 2015 and 2014 are as follows:
 
December 31,
 
2016

2015

2014
Balance at beginning of year
$
11.6


$
13.3


$
14.6

Deficiency payments made
0.2


0.1


—

Deficiency repayment received
(1.9
)

(1.8
)

(1.3
)
Balance at end of year
$
9.9


$
11.6


$
13.3