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Income Taxes: Current and Deferred Income Tax (Expense) Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ 16.5	$ 0.8	$ 0.5
State	(0.8)	(1.0)	(0.1)
Current income tax benefit (expense)	15.7	(0.2)	0.4
Deferred:
Federal	(47.2)	(30.9)	(23.2)
State	(4.8)	5.5	(2.4)
Deferred income tax (expense)	(52.0)	(25.4)	(25.6)
Income tax (expense)	$ (36.3)	$ (25.6)	$ (25.2)

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