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Other Postretirement Benefit Plans - Change in Plan Assets (Details) - Postretirement Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets:
Fair value of plan assets at beginning of year	$ 0.0	$ 11.1
Transfer to VEBA trust for certain active employees' medical benefits	0.0	(11.1)
Fair value of plan assets at end of year	0.0	0.0
Funded status at end of year	$ (35.5)	$ (51.1)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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