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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Policy [Policy Text Block]
Property, Plant and Equipment
Property, plant and equipment are stated at cost less accumulated depreciation. Depreciation is applied using a straight-line method over the useful lives of the respective assets as described in the following table:
 
Estimated Useful Life
Land improvements
20 years
Buildings
45 years
Machinery and equipment
3-20 years
Tooling — Airplane program — B787, Rolls-Royce
5-20 years
Tooling — Airplane program — all others
2-10 years
Capitalized software
3-7 years

The Company capitalizes certain costs, such as software coding, installation, and testing, that are incurred to purchase or to create and implement internal-use computer software. The Company’s capitalization policy includes specifications that the software must have a service life greater than one year, is legally and substantially owned by Spirit, and has an acquisition cost of greater than $0.1.
Where the Company is involved in build-to-suit leasing arrangements, the Company is deemed the owner of the asset for accounting purposes during the construction period of the asset. The Company records the related assets and liabilities for construction costs incurred under these build-to-suit leasing arrangements during the construction period. Upon completion of the asset, the Company considers whether the assets and liabilities qualify for derecognition under the sale-leaseback accounting guidance.
   
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]      
Product Warranty And Extraordinary Rework, Beginning Balance $ 104.8 $ 166.4 $ 163.7
Charges to costs and expenses (13.9) 3.2 5.8
Product Warranty Accrual, Payments (1.7) (1.2) (4.0)
Write-offs, net of recoveries 0.0 (63.8) 0.0
Exchange rate 0.5 0.2 0.9
Product Warranty And Extraordinary Rework, Ending Balance 64.7 104.8 166.4
Affiliates [Line Items]      
Valuation Allowance, Deferred Tax Asset, Change in Amount (3.2) (2.2) $ 1.6
Equity in net assets of affiliates 7.7 0.0  
Deferred Tax Assets, Valuation Allowance $ 10.2 $ 13.2  
Land and Land Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 20 years    
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 45 years    
Machinery and Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 20 years    
Machinery and Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Tooling Airplane Program B787 Rolls Royce [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 20 years    
Tooling Airplane Program B787 Rolls Royce [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Tooling Airplane Program All Others [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 10 years    
Tooling Airplane Program All Others [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 2 years    
Software [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 7 years    
Software [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Capitalization Policy, Service Life 1 year    
Capitalization Policy, Software, Acquisition Cost $ 0.1