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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Feb. 28, 2024 | Dec. 31, 2022 | Oct. 28, 2021 | Aug. 06, 2020 | Dec. 31, 2007
Class of Stock [Line Items] |  |  |  |  |  |
Shares registered | 400,000,000 |  | 400,000,000 |  | 3,400,000 |
Federal net operating loss carry-forward | $ 4.0 |  |  |  |  |
Class A Common Stock [Member] | November 16, 2007 Registration Statement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares reclassified as authorized and unissued | 1,200,000 |  |  |  |  |
Shares registered |  |  |  |  |  | 4,000,000.0
Class A Common Stock [Member] | February 26,2021 Registration Statement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Securities issued | 0 |  | 0 |  |  |
2020 Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares registered |  |  |  |  | 3,000,000.0 |
2010 Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares registered |  |  |  |  | 400,000 |
New Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, remaining authorization |  | $ 404.7 |  |  |  |
New Plan [Member] | Class A Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized |  |  |  | $ 1,000.0 |  |
Real Estate Investment Trust [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Federal net operating loss carry-forward | $ 382.3 |  |  |  |  |

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