Property and Equipment (Narrative) (Details) - Flight Equipment [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating Leases, Future Minimum Payments Receivable [Abstract]
Minimum future lease payments, Due within next 12 months	$ 186.8
Minimum future lease payments, Due within next 2 years	178.2
Minimum future lease payments, Due within next 3 years	152.0
Minimum future lease payments, Due within next 4 years	110.1
Minimum future lease payments, Due within next 5 years	75.5
CAM [Member]
Property, Plant and Equipment [Line Items]
Leased aircraft, carrying value	$ 889.3	$ 803.7

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the third year from the balance sheet date under an operating lease.

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Future rental payments receivable within the second year from the balance sheet date under an operating lease.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

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