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Revenue Recognition - Schedule of Impact of the Change in Contract Estimates on Operating Results (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Change in Accounting Estimate [Line Items]    
Net (unfavorable) favorable effect of the changes in contract estimates on net sales $ 492.0 $ 405.3
Net (unfavorable) favorable effect of the changes in contract estimates on income before income taxes 18.7 9.2
Net (unfavorable) favorable effect of the changes in contract estimates on net income 14.0 5.9
Aerospace and Defense | Contracts Accounted for under Percentage-of-Completion    
Change in Accounting Estimate [Line Items]    
Net (unfavorable) favorable effect of the changes in contract estimates on net sales (7.4) 3.9
Net (unfavorable) favorable effect of the changes in contract estimates on income before income taxes (7.9) 3.4
Net (unfavorable) favorable effect of the changes in contract estimates on net income $ (5.9) $ 2.0
Net (unfavorable) favorable effect of the changes in contract estimates on basic and diluted net income per share (in USD per share) $ (0.08) $ 0.03