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Consolidated Statements Of Comprehensive Income (Parenthetical) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Statement of Comprehensive Income [Abstract]        
Other comprehensive income/(loss), tax $ 0.2 $ 4.4 $ 3.7 $ (4.6)
Reclassifications to earnings of realized gains/(losses) on available-for-sale securities   $ 0.0 $ 0.0 $ 5.6