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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 108.2	$ 78.8	$ 301.9	$ 96.0
Other comprehensive income, net of tax:
Unrealized gain on securities, net of tax	0.1	2.1	1.4	1.9
Other comprehensive income	0.1	2.1	1.4	1.9
Comprehensive income	$ 108.3	$ 80.9	$ 303.3	$ 97.9

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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