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Income Taxes - Components of Federal and State Income Tax Provisions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax (expense) benefit:
Current expense (benefit)	$ (15.4)	$ 0.0	$ 0.0
Deferred expense (benefit)	(232.7)	(87.9)	5.5
Total income tax expense (benefit)	$ (248.1)	$ (87.9)	$ 5.5

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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