Changes in Estimates (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2020

Oct. 01, 2020

Jul. 02, 2020

Apr. 02, 2020

Dec. 31, 2019

Sep. 26, 2019

Jun. 27, 2019

Mar. 28, 2019

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Change In Estimate [Line Items]

Change In Accounting Estimate, aggregate, affecting earnings from continuing operations

$ 400.7

$ 123.8

$ (231.8)

$ 27.9

$ 55.2

$ 41.8

$ 10.9

$ 0.5

$ (400.7)

$ (65.5)

$ 0.1

Changes in Accounting Estimates - Contract Accounting, aggregate, Affecting earnings from Continuing Operations, per Share diluted

$ (3.07)

$ (0.50)

$ 0

Change in Accounting Estimate - Contract Accounting

$ (370.3)

$ (63.5)

$ 3.9

Change in Accounting Estimate, Description

Changes in Estimates The Company has a periodic forecasting process in which management assesses the progress and performance of the Company’s programs. This process requires management to review each program’s progress by evaluating the program schedule, changes to identified risks and opportunities, changes to estimated revenues and costs for the accounting contracts (and options if applicable), and any outstanding contract matters. Risks and opportunities include but are not limited to management’s judgment about the cost associated with the Company’s ability to achieve the schedule, technical requirements (e.g., a newly-developed product versus a mature product), and any other program requirements. Due to the span of years it may take to completely satisfy the performance obligations for the accounting contracts (and options, if any) and the scope and nature of the work required to be performed on those contracts, the estimation of total revenue and costs is subject to many variables and, accordingly, is subject to change based upon judgment. When adjustments in estimated total consideration or estimated total cost are required, any changes from prior estimates for fully satisfied performance obligations are recognized in the current period as a cumulative catch-up adjustment for the inception-to-date effect of such changes. Cumulative catch-up adjustments are driven by several factors including production efficiencies, assumed rate of production, the rate of overhead absorption, changes to scope of work, and contract modifications. Cumulative catch-up adjustments are primarily related to changes in the estimated margin of contracts with performance obligations that are satisfied over time.Changes in estimates are summarized below:Changes in EstimatesDecember 31, 2020December 31, 2019December 31, 2018(Unfavorable) Favorable Cumulative Catch-up Adjustments by SegmentFuselage(17.5)(1.3)(5.3)Propulsion(7.8)(1.2)(0.2)Wing(5.1)0.5 1.7 Total (Unfavorable) Favorable Cumulative Catch-up Adjustment(30.4)(2.0)(3.8)(Forward Loss) and Changes in Estimates on Loss Programs by SegmentFuselage(274.3)(37.9)3.4 Propulsion(36.9)(15.1)(0.7)Wing(59.1)(10.5)1.2 Total (Forward Loss) and Change in Estimate on Loss Program(370.3)(63.5)3.9 Total Change in Estimate(400.7)(65.5)0.1 EPS Impact (diluted per share based on statutory tax rate)(3.07)$(0.50)— 2020 Changes in EstimatesDuring the twelve months ended December 31, 2020, the Company recognized net forward loss charges of $370.3 primarily driven by production rate changes on B787 and A350 from 10 aircraft per month to 5 aircraft per month and 9 aircraft per month to 4 aircraft per month, respectively. Unfavorable cumulative catch up adjustments of $30.4 were primarily driven by rate reduction across all overtime programs due to the COVID-19 pandemic.2019 Changes in EstimatesDuring the twelve months ended December 31, 2019, the Company recognized net forward loss charges of $65.5 primarily driven by the production rate change on B787 from 14 aircraft per month to 10 aircraft per month. 2018 Changes in EstimatesFavorable changes in estimates on loss programs were primarily driven by favorable performance on cost initiatives and mitigation of risks, partially offset by forward loss charges due to the adoption of ASU 2017-07 on the B787 program. Total unfavorable cumulative catch-up adjustments were driven by increased production costs incurred due to factory disruption challenges on the B737 program.

Cumulative catch-up adjustment [Member]