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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated other comprehensive income(loss) |  |  |
Amounts reclassified from accumulated other comprehensive income(loss) | $ 12.8 | $ 0.0 | $ 0.0
Gains and Losses on Available-For-Sale Securities |  |  |
Accumulated other comprehensive income(loss) |  |  |
Net current-period other comprehensive income | 9.9 | 20.0 | 2.7
Foreign Currency Items |  |  |
Accumulated other comprehensive income(loss) |  |  |
Net current-period other comprehensive income | $ 3.5 | $ 4.5 | $ 1.3

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