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Segment Information (Details)
$ in Millions
3 Months Ended
Mar. 29, 2018
USD ($)
segment
Mar. 30, 2017
USD ($)
Segment Reporting Information [Line Items]    
Cost of Goods and Services Sold $ 1,511.0 $ 1,421.0
Segment Revenues    
Segment Revenues 1,736.1  
Revenues 1,736.1 1,694.1
Segment Operating Income    
Business Segment Operating Income 222.4 274.3
Segment Information Unallocated Corporate Selling General And Administrative (56.2) (52.9)
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds 0.0 (10.8)
Segment Information Unallocated Research And Development (9.4) (5.0)
Segment Information Unallocated Cost Of Sales 2.7 (1.2)
Operating income $ 159.5 204.4
Segment Reporting Information, Additional Information [Abstract]    
Number Of Principal Segments | segment 3  
Percentage Of Net Revenue Derived From Two Largest Customers 95.00%  
Fuselage Systems [Member]    
Segment Revenues    
Segment Revenues $ 962.7 916.9
Segment Operating Income    
Business Segment Operating Income 119.7 145.9
Propulsion Systems [Member]    
Segment Revenues    
Segment Revenues 394.5 406.3
Segment Operating Income    
Business Segment Operating Income 52.9 71.8
Wing Systems [Member]    
Segment Revenues    
Segment Revenues 377.0 369.0
Segment Operating Income    
Business Segment Operating Income 50.8 56.7
Other Systems [Member]    
Segment Revenues    
Segment Revenues 1.9 1.9
Segment Operating Income    
Business Segment Operating Income $ (1.0) (0.1)
Impact of 2017-07 [Member]    
Segment Reporting Information [Line Items]    
Cost of Goods and Services Sold   8.2
Impact of 2017-07 [Member] | Fuselage Systems [Member]    
Segment Reporting Information [Line Items]    
Cost of Goods and Services Sold   4.5
Impact of 2017-07 [Member] | Propulsion Systems [Member]    
Segment Reporting Information [Line Items]    
Cost of Goods and Services Sold   1.9
Impact of 2017-07 [Member] | Wing Systems [Member]    
Segment Reporting Information [Line Items]    
Cost of Goods and Services Sold   $ 1.8