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Consolidated Statements Of Comprehensive Income (Parenthetical) (Unaudited) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract] |  |
Other comprehensive income/(loss), tax | $ 20.8 | $ 6.4
Reclassifications to earnings of realized gains/(losses) on available-for-sale securities | $ 0.0 | $ 0.0

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