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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Unrealized gains (losses) arising during the period, tax expense (benefit) $ 0.0 $ 0.3 $ 0.1 $ 0.9
Reclassification adjustments for (gains) losses included in net income, tax expense (benefit) 0.2 (0.1) 0.4 (0.3)
Unrealized gains (losses) arising during the period, tax expense (benefit) $ 0.0 $ (0.2) $ 0.0 $ (0.2)