Basis of Presentation and Nature of Operations - Summary of Impact from the Aerospace and Defense Segment Net Sales (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Change in Accounting Estimate [Line Items]
Favorable (unfavorable) effect of the changes in contract estimates on income before income taxes	$ 18.6	$ (25.3)	$ 64.0	$ (5.2)
Favorable (unfavorable) effect of the changes in contract estimates on net income	$ 12.6	$ (11.1)	$ 42.8	$ (0.1)
Favorable (unfavorable) effect of the changes in contract estimates on basic and diluted net income per share (in USD per share)	$ 0.17	$ (0.17)	$ 0.57	$ 0.00
Contracts Accounted for under Percentage-of-Completion
Change in Accounting Estimate [Line Items]
Favorable (unfavorable) effect of the changes in contract estimates on income before income taxes	$ 11.5	$ 1.1	$ 25.2	$ (2.3)
Favorable (unfavorable) effect of the changes in contract estimates on net income	$ 6.9	$ 0.7	$ 15.1	$ (1.4)
Favorable (unfavorable) effect of the changes in contract estimates on basic and diluted net income per share (in USD per share)	$ 0.09	$ 0.01	$ 0.20	$ (0.02)