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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 286.1 $ 535.8 $ 958.3
Other comprehensive income (Loss), net of tax [Abstract]      
Unrealized gain (loss) on securities, net of tax 1.9 (3.1) (1.4)
Other comprehensive income (loss) 1.9 (3.1) (1.4)
Comprehensive income $ 288.0 $ 532.7 $ 956.9