Bradley Agreement (Tables)

6 Months Ended

Jun. 30, 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 three and six months ended June 30, 2020 and 2019 were as follows:

	Three Months Ended				Six Months Ended
(millions) (unaudited)	June 30, 2020		June 30, 2019		June 30, 2020		June 30, 2019
Deficiency repayments	$	—	$	1.8	$	0.1	$	2.4
Interest		—		0.5		0.1		0.5
Premium		—		0.2		—		0.2