Capital Stock	12 Months Ended
Dec. 31, 2015
Class of Stock Disclosures [Abstract]
Capital Stock	Capital Stock Holdings has authorized 360,000,000 shares of stock. Of that, 200,000,000 shares are class A common stock, par value $0.01 per share, one vote per share, 150,000,000 shares are class B common stock, par value $0.01 per share, one vote per share and 10,000,000 shares are preferred stock, par value $0.01 per share. In March, June and August 2014, certain selling stockholders sold 22,915,300 shares of the Company's class A common stock at prices to the public ranging from $28.62 to $35.90 per share in secondary offerings of the Company's class A common stock. Following the August offering, Onex no longer held any investment in the Company. In association with the Boeing Acquisition, Spirit executives with balances in Boeing's Supplemental Executive Retirement Plan (SERP) were authorized to purchase a fixed number of units of Holdings "phantom stock" at $3.33 per unit based on the present value of their SERP balances. Under this arrangement, 860,244 phantom units were purchased. Any payment on account of units may be made in cash or shares of common stock at the sole discretion of Holdings. The balance of SERP units was 94,143 and 227,820 as of December 31, 2015 and December 31, 2014, respectively. Repurchases of Common Stock During the period ended December 31, 2014, the Company repurchased $4.0 million shares of its class A common stock for $129.2. In July 2015, the Company's Board of Directors authorized a share repurchase program for the purchase of up to $350.0 of the Company's common stock by December 31, 2017. During the period ended December 31, 2015, the Company repurchased 5.7 million shares of its class A common stock for $300.0. The Company had remaining $50.0 authorized by the Board of Directors for repurchase, which it used in January 2016 through the purchase of 1.0 million shares of class A common stock.

Capital Stock

Holdings has authorized 360,000,000 shares of stock. Of that, 200,000,000 shares are class A common stock, par value $0.01 per share, one vote per share, 150,000,000 shares are class B common stock, par value $0.01 per share, one vote per share and 10,000,000 shares are preferred stock, par value $0.01 per share.

In March, June and August 2014, certain selling stockholders sold 22,915,300 shares of the Company's class A common stock at prices to the public ranging from $28.62 to $35.90 per share in secondary offerings of the Company's class A common stock. Following the August offering, Onex no longer held any investment in the Company.

In association with the Boeing Acquisition, Spirit executives with balances in Boeing's Supplemental Executive Retirement Plan (SERP) were authorized to purchase a fixed number of units of Holdings "phantom stock" at $3.33 per unit based on the present value of their SERP balances. Under this arrangement, 860,244 phantom units were purchased. Any payment on account of units may be made in cash or shares of common stock at the sole discretion of Holdings. The balance of SERP units was 94,143 and 227,820 as of December 31, 2015 and December 31, 2014, respectively.

Repurchases of Common Stock

During the period ended December 31, 2014, the Company repurchased $4.0 million shares of its class A common stock for $129.2.

In July 2015, the Company's Board of Directors authorized a share repurchase program for the purchase of up to $350.0 of the Company's common stock by December 31, 2017.

During the period ended December 31, 2015, the Company repurchased 5.7 million shares of its class A common stock for $300.0. The Company had remaining $50.0 authorized by the Board of Directors for repurchase, which it used in January 2016 through the purchase of 1.0 million shares of class A common stock.