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Nature of Operations and Summary of Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Inventories |  |
Inventory allowance | $ 22.1 | $ 17.1

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- References No definition available. + Details
Name: | us-gaap_AirlineRelatedInventoryGrossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the valuation account as of the balance sheet date which reduces the carrying amount of airline related inventory (including expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers or freight) to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. + References No definition available. + Details
Name: | us-gaap_AirlineRelatedInventoryValuationReserves
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant