Basis of Presentation and Nature of Operations (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

AR1 Inception to Date Project Costs

The AR1 inception to date, beginning in 2015, project costs at March 31, 2018, were as follows (in millions):

AR1 R&D costs incurred	$	266.4
Less amounts funded by the U.S. Air Force	(161.9		)
Less amounts funded by ULA	(9.6		)
AR1 R&D costs net of reimbursements	$	94.9