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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 107.4	$ 288.6	$ 321.7	$ 490.7
Other comprehensive loss, net of tax:
Unrealized loss on securities, net of tax	(0.7)	0.0	(2.4)	(0.7)
Other comprehensive loss	(0.7)	0.0	(2.4)	(0.7)
Comprehensive income	$ 106.7	$ 288.6	$ 319.3	$ 490.0

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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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