Acquisitions (Notes)	12 Months Ended
Dec. 31, 2023
Business Combinations [Abstract]
T.E.A.M., Inc. Acquisition	T.E.A.M., Inc. On November 23, 2022, Spirit AeroSystems Textiles, LLC ("Spirit Textiles"), a fully owned subsidiary of Spirit AeroSystems, Inc. closed its purchase of substantially all of the assets and all of the liabilities of T.E.A.M., Inc., a Rhode Island corporation, which is engaged in the business of manufacturing and engineering textiles, composites, and textile and composite products, for cash consideration of $31.3. The acquisition was accounted for as a business combination in accordance with ASC Topic 805, Business Combinations. The purchase price has been allocated among assets acquired and liabilities assumed at fair value based on information currently available, with the excess purchase price recorded as goodwill, which is fully allocated to the Defense & Space segment. As of December 31, 2022, the Company had preliminarily concluded, but not finalized, its assessment and purchase price allocation of the acquisition. The final fair value determination is subject to a contractual post-closing working capital true-up, which the Company concluded in the first quarter of 2023. The final purchase price allocation resulted in $0.6 adjustments to the assets acquired and the liabilities assumed that were recorded as of the acquisition date, which were included in the Consolidated Balance Sheet as of December 31, 2022. The adjusted assets acquired and the liabilities assumed included $8.3 of property, plant and equipment, $1.7 of working capital, $13.5 of intangible assets and $7.7 allocated to goodwill, which is expected to be deductible for tax purposes. Operating income is immaterial and reported within the Defense & Space segment. Acquisition-related expenses were $1.2 for the twelve months ended December 31, 2022, and are included in selling, general and administrative costs on the Consolidated Statements of Operations. There were no acquisition-related expenses for the twelve months ended December 31, 2023.

On November 23, 2022, Spirit AeroSystems Textiles, LLC ("Spirit Textiles"), a fully owned subsidiary of Spirit AeroSystems, Inc. closed its purchase of substantially all of the assets and all of the liabilities of T.E.A.M., Inc., a Rhode Island corporation, which is engaged in the business of manufacturing and engineering textiles, composites, and textile and composite products, for cash consideration of $31.3. The acquisition was accounted for as a business combination in accordance with ASC Topic 805, Business Combinations. The purchase price has been allocated among assets acquired and liabilities assumed at fair value based on information currently available, with the excess purchase price recorded as goodwill, which is fully allocated to the Defense & Space segment. As of December 31, 2022, the Company had preliminarily concluded, but not finalized, its assessment and purchase price allocation of the acquisition. The final fair value determination is subject to a contractual post-closing working capital true-up, which the Company concluded in the first quarter of 2023. The final purchase price allocation resulted in $0.6 adjustments to the assets acquired and the liabilities assumed that were recorded as of the acquisition date, which were included in the Consolidated Balance Sheet as of December 31, 2022. The adjusted assets acquired and the liabilities assumed included $8.3 of property, plant and equipment, $1.7 of working capital, $13.5 of intangible assets and $7.7 allocated to goodwill, which is expected to be deductible for tax purposes. Operating income is immaterial and reported within the Defense & Space segment.