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Lease Accounting (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |  |  |
Operating lease costs |  | $ 18.4 | $ 30.2 | $ 27.2
Mileage credits |  | $ 20.8 | 18.4 | $ 24.8
Fixed lease payments per year |  |  | $ 5.2 |
Fixed lease interest rate per year |  |  | 10.25% |
Early payment received on direct finance lease | $ 41.0 |  |  |
Direct finance lease receivable |  |  | $ 70.0 |

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- Definition Annual rate of interest earned under a direct financing lease. + References No definition available. + Details
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- Definition Fixed annual lease payments received under a direct financing lease. + References No definition available. + Details
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- Definition Mileage Credits, related to lease expense + References No definition available. + Details
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- Definition Sales-type and Direct Financing Leases, Early Payment Received + References No definition available. + Details
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- Definition Sales-type Direct Financing Lease, Account Receivable + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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