Property and Equipment (Narrative) (Details) - Flight Equipment [Member] - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Operating Leases, Future Minimum Payments Receivable [Abstract]
Minimum future lease payments, Due within next 12 months	$ 222.4	$ 192.3
Minimum future lease payments, Due within next 2 years	195.5	212.8
Minimum future lease payments, Due within next 3 years	150.5	168.3
Minimum future lease payments, Due within next 4 years	99.8	117.6
Minimum future lease payments, Due within next 5 years	$ 90.7	105.4
CAM [Member]
Property, Plant and Equipment [Line Items]
Leased aircraft, carrying value		$ 1,208.9	$ 1,097.6

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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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