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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other comprehensive income/(loss), tax $ 20.2 $ (11.2) $ 3.3
Reclassifications to earnings of realized gains/(losses) on available-for-sale securities (0.2) (2.9) 0.2
Increase in accumulated comprehensive income 17.9    
Reclassifications to earnings of gains/(losses) on cash flow hedging instruments 3.3 $ 4.9 $ (0.6)
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