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Summary Of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Loan impairment threshold period | 90 days |  |
Threshold of reporting unit goodwill carrying value for further analysis | $ 0 |  |
Goodwill impairment charges | 0 |  |
Allowance for doubtful accounts | 18,700,000 | $ 14,300,000 |
Incremental payments due upon termination of contract | 0 |  |
Right-of-use assets | 793,200,000 | 725,800,000 |
Lease liabilities | 839,806,000 | $ 766,000,000.0 |
ASU 2016-13 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Increase in allowance for credit losses | 10,400,000 |  |
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative adjustments for accounting changes | 7,800,000 |  |
Cumulative adjustments for accounting changes | 7,800,000 |  |
ASU 2017-08 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative adjustments for accounting changes |  |  | $ 4,400,000
Cumulative adjustments for accounting changes |  |  | 4,400,000
ASU 2016-02 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Right-of-use assets |  |  | $ 670,000,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  | us-gaap:PropertyPlantAndEquipmentNet
Lease liabilities |  |  | $ 670,000,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
ASU 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative adjustments for accounting changes |  |  | $ 6,700,000
Cumulative adjustments for accounting changes |  |  | $ 6,700,000
ASU 2018-02 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Reclassification adjustment related to cash flow hedges and investment portfolio credit risk | $ 3,100,000 |  |
Office Equipment [Member] | Minimum [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Fixed assets, Useful life | 2 years |  |
Office Equipment [Member] | Maximum [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Fixed assets, Useful life | 7 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Fixed assets, Useful life | 3 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Fixed assets, Useful life | 39 years |  |
Aircraft Engines Held for Operating Lease [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Fixed assets, Useful life | 30 years |  |
Fixed assets, residual value percentage | 15.00% |  |

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