Revenue Recognition - Schedule of Impact of the Change in Contract Estimates on Operating Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Change in Accounting Estimate [Line Items]
Net favorable effect of the changes in contract estimates on net sales	$ 467.2	$ 459.6	$ 959.2	$ 864.9
Net favorable effect of the changes in contract estimates on income before income taxes	47.3	36.2	66.0	45.4
Net favorable effect of the changes in contract estimates on net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.46	$ 0.32	$ 0.65	$ 0.41
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.45	$ 0.32	$ 0.64	$ 0.41
Aerospace and Defense | Contracts Accounted for under Percentage-of-Completion
Change in Accounting Estimate [Line Items]
Net favorable effect of the changes in contract estimates on net sales	$ 26.2	$ 9.6	$ 18.8	$ 13.5
Net favorable effect of the changes in contract estimates on income before income taxes	22.0	10.3	14.1	13.7
Net favorable effect of the changes in contract estimates on net income	$ 16.3	$ 6.2	$ 10.4	$ 8.2
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.22	$ 0.08	$ 0.14	$ 0.11
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.21	$ 0.08	$ 0.14	$ 0.11