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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other comprehensive income/(loss), tax | $ (11.5) | $ (20.2) | $ 11.2
Reclassifications to earnings of realized gains/(losses) on available-for-sale securities |  |  | (2.9)
Increase in accumulated comprehensive income |  | 17.9 |
Reclassifications to earnings of gains/(losses) on cash flow hedging instruments |  | $ 3.3 | $ 4.9
ASU 2019-04 [Member] |  |  |
Increase in accumulated comprehensive income | 17.9 |  |
ASU 2018-02 [Member] |  |  |
Reclassification to retained earnings related to cash flow hedges and investment portfolio risk | $ 3.1 |  |

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