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Consolidated Statements Of Comprehensive Income (Parenthetical) (Unaudited) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract] |  |
Other comprehensive income/(loss), tax | $ 6.4 | $ 27.9
Reclassifications to earnings of realized losses on available-for-sale securities | $ 0.0 | (0.5)
Reclassifications to earnings of gains (loss) on cash flow hedging instruments |  | $ 0.3

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