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Segment Information (Details)
$ in Millions
3 Months Ended
Apr. 02, 2020
USD ($)
segment
Mar. 28, 2019
USD ($)
Segment Reporting Information [Line Items]    
Cost of Goods and Services Sold $ 1,112.5 $ 1,658.3
Segment Revenues    
Segment Revenues 1,077.3 1,967.8
Segment Operating Income    
Business Segment Operating Income (76.3) 301.4
Segment Information Unallocated Corporate Selling General And Administrative (77.4) (63.6)
Segment Information Unallocated Research And Development (12.3) (12.9)
Segment Information Unallocated Cost Of Sales (1.5) 8.1
Operating (loss) income $ (167.5) 233.0
Segment Reporting Information, Additional Information [Abstract]    
Number Of Principal Segments | segment 3  
Percentage Of Net Revenue Derived From Two Largest Customers 89.00%  
Fuselage Systems [Member]    
Segment Revenues    
Segment Revenues $ 551.5 1,069.6
Segment Operating Income    
Business Segment Operating Income (86.4) 138.9
Propulsion Systems [Member]    
Segment Revenues    
Segment Revenues 225.2 485.7
Segment Operating Income    
Business Segment Operating Income (5.3) 95.5
Wing Systems [Member]    
Segment Revenues    
Segment Revenues 291.4 407.9
Segment Operating Income    
Business Segment Operating Income 13.6 65.8
Other Systems [Member]    
Segment Revenues    
Segment Revenues 9.2 4.6
Segment Operating Income    
Business Segment Operating Income $ 1.8 $ 1.2