Property and Equipment (Narrative) (Details) - Flight Equipment [Member] - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Operating Leases, Future Minimum Payments Receivable [Abstract]
Minimum future lease payments, Due within next 12 months	$ 200.8
Minimum future lease payments, Due within next 2 years	229.6
Minimum future lease payments, Due within next 3 years	179.6
Minimum future lease payments, Due within next 4 years	167.7
Minimum future lease payments, Due within next 5 years	149.6
CAM [Member]
Property, Plant and Equipment [Line Items]
Leased aircraft, carrying value	$ 1,416.7	$ 1,404.4

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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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Amount, after accumulated depreciation, of lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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