Pension and Other Post Retirement Plans (Details 5) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Apr. 01, 2006	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Post Retirement one percentage change increase		$ 5.7
Service and interest on percentage change increase		0.4
Post Retirement one percentage change decrease		5.2
Service and interest on percentage change decrease		0.4
Defined Contribution Plan [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		75.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	8.00%	8.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	4.00%
Multiemployer Plans [Line Items]
IAM Level of Contribution per hour until June 2010		1.35
Level of Contribution per hour effective July 2010		1.50
Level of Contribution per hour Increase		0.05
EIN/Pensions plan number		51-60321295
Multiemployer Plans, Certified Zone Status		Green	Green
FIP RP Status		No
Contributions		27.9	25.9	22.8
Multiemployer Plans Surcharge		No
Year Company Contributions Exceed 5 Percent		2011, 2012, 2013
Required Pension Contributions [Abstract]
Serp And Post Retirement Medical Plan Contributions Maximum		2.9
Expected Contributions Uk Plan		0.7
IAM [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans Collective Bargaining Arrangement Expiration Date		Jun. 27, 2020
UAW [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans Collective Bargaining Arrangement Expiration Date		Nov. 30, 2020
2010 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.30
2011 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.45
2012 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.50
2014 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.55
2016 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.60
2018 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.65
2019 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.70
2020 [Member]
Multiemployer Plans [Line Items]
UAW Level of Contribution per hour		1.75
U.S. [Member]
Defined Contribution Plan [Abstract]
Defined Contribution Plan		Defined Benefit Pension PlansEffective June 17, 2005, pension assets and liabilities were spun-off from three Boeing qualified plans into four qualified Spirit AeroSystems plans for each Spirit employee who did not retire from Boeing by August 1, 2005. Effective December 31, 2005, all four qualified plans were merged together. In addition, Spirit has one nonqualified plan providing supplemental benefitsto executives (SERP) who transferred from a Boeing nonqualified plan to a Spirit AeroSystems plan and elected to keep their benefits in this plan. Both plans are frozen as of the date of the Boeing Acquisition (i.e., no future service benefits are being earned in these plans). We intend to fund our qualified pension plan through a trust. Pension assets are placed in trust solely for the benefit of the pension plans' participants and are structured to maintain liquidity that is sufficient to pay benefit obligations.
Company contribution		39.1	39.5	38.4
Defined Contribution Plan Description		The Company contributes to a defined contribution plan available to all U.S. employees, excluding IAM and UAW represented employees. Under the plan, the Company makes a matching contribution of 75% of the employee contribution to a maximum 8% of eligible individual employee compensation. In addition, non-matching contributions based on an employee's age and years of service are paid at the end of each calendar year for certain employee groups.The Company recorded $39.1, $39.5 and $38.4 in contributions to these plans for the twelve months ended December 31, 2013, December 31, 2012 and December 31, 2011, respectively.
U.K. [Member]
Defined Contribution Plan [Abstract]
Defined Contribution Plan		On April 1, 2006, as part of the acquisition of BAE Aerostructures, the Company established a defined benefit pension plan for those employees that had pension benefits remaining in BAE Systems' pension plan.  In accordance with U.K. legislation, the plan and its assets are managed by an independent trustee company.  The investment strategy adopted by this trustee is documented in a Statement of Investment Principles in line with U.K. legislation. The principles for the investment strategy are to maximize the long-term rate of return on plan assets within an acceptable level of risk while maintaining adequate funding levels. The trustee has invested the plan assets in pooled arrangements with authorized investment companies which were selected to be consistent with the plan's overall investment principles and strategy. The specified target asset allocation is 55% equities, 5% real estate, 20% corporate bonds and 20% government bonds.  Effective December 31, 2013, the U.K. pension plan was closed and benefits were frozen and thereafter subject only to statutory pension revaluation, resulting in a net curtailment gain of $13.1. This gain was due to the loss of salary linkage for employed members of the plan, less the cost of other benefit changes made as part of the plan closure. On April 1, 2006, as part of the acquisition of BAE Aerostructures, the Company established a defined contribution pension plan for those employees who are hired after the date of acquisition. Under the plan, the Company contributes 8% of basic salary while participating employees are required to contribute 4% of basic salary. The Company recorded $1.8 in contributions to this plan for the period ended December 31, 2013, $0.8 in contributions for the period ended December 31, 2012 and $0.7 in contributions for the period ended December 31, 2011.
Company contribution		$ 1.8	$ 0.8	$ 0.7
Other Benefits [Member]
Multiemployer Plans [Line Items]
Description of Multiemployer Plan		Other Post-Retirement Benefit PlansWe also have post-retirement health care coverage for eligible U.S. retirees and qualifying dependents prior to age 65. Eligibility for employer-provided benefits is limited to those employees who were employed at the date of acquisition (Spirit) and retire on or after attainment of age 62 and 10 years  of service. Employees who do not satisfy these eligibility requirements can retire with post-retirement medical benefits at age 55 and 10 years  of service, but they must pay the full cost of medical benefits provided.