Revenue Recognition - Schedule of Impact of the Change in Contract Estimates on Operating Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Change in Accounting Estimate [Line Items]
Net favorable effect of the changes in contract estimates on net sales	$ 527.7	$ 481.8	$ 1,516.2	$ 1,458.5
Net favorable effect of the changes in contract estimates on income before income taxes	40.7	43.5	136.9	154.7
Net favorable effect of the changes in contract estimates on net income	$ 31.7	$ 32.9	$ 102.3	$ 115.7
Net favorable effect of the changes in contract estimates on basic EPS (USD per share)	$ 0.40	$ 0.42	$ 1.30	$ 1.47
Net favorable effect of the changes in contract estimates on diluted EPS (USD per share)	$ 0.38	$ 0.39	$ 1.23	$ 1.39
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	$ 3.2	$ 4.7	$ 20.4	$ 43.5
Net favorable effect of the changes in contract estimates on income before income taxes	3.2	4.0	21.4	43.0
Net favorable effect of the changes in contract estimates on net income	$ 2.7	$ 2.9	$ 16.0	$ 31.6
Net favorable effect of the changes in contract estimates on basic EPS (USD per share)	$ 0.03	$ 0.04	$ 0.20	$ 0.40
Net favorable effect of the changes in contract estimates on diluted EPS (USD per share)	$ 0.03	$ 0.03	$ 0.19	$ 0.38