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Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 535.8	$ 958.3	$ 421.0
Other comprehensive income (Loss), net of tax [Abstract]
Unrealized gain (loss) on securities, net of tax	(3.1)	(1.4)	0.8
Other comprehensive income (loss)	(3.1)	(1.4)	0.8
Comprehensive income	$ 532.7	$ 956.9	$ 421.8

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