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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]    
Unrealized gains (losses) arising during the period, tax expense (benefit) $ 0.0 $ 0.4
Reclassification adjustments for (gains) losses included in net income, tax expense (benefit) 0.1 (0.1)
Unrealized gains (losses) arising during the period, tax expense (benefit) $ 0.0 $ 0.0