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Basis of Presentation and Nature of Operations (Tables)
 6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
AR1 Inception to Date Project Costs
The AR1 inception to date project costs at June 30, 2017 were as follows (in millions):
AR1 R&D costs incurred
$
228.4

Less amounts funded by the U.S. Air Force
(135.3
)
Less amounts funded by ULA
(9.2
)
AR1 R&D costs net of reimbursements
83.9

AR1 R&D costs expensed and not applied to contracts
(32.1
)
Net AR1 R&D costs applied to contracts
$
51.8
Summary of Impact from the Aerospace and Defense Segment Net Sales
The following table summarizes the impact of the change in significant contract accounting estimates on the Company’s Aerospace and Defense segment net sales accounted for under the percentage-of-completion method of accounting:
 
Three months ended June 30,
 
Six months ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(In millions, except per share amounts)
Favorable (unfavorable) effect of the changes in contract estimates on income before income taxes
$
10.3

 
$
(3.6
)
 
$
13.7

 
$
(3.6
)
Favorable (unfavorable) effect of the changes in contract estimates on net income
6.2

 
(2.1
)
 
8.2

 
(2.1
)
Favorable (unfavorable) effect of the changes in contract estimates on basic and diluted net income per share
0.08

 
(0.03
)
 
0.11

 
(0.03
)