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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ (25.8)	$ 29.7	$ (8.6)	$ 53.5
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial gain included in net periodic cost, net of tax	0.0	(0.1)	(0.1)	(0.1)
Other comprehensive income (loss), net of tax	0.0	(0.1)	(0.1)	(0.1)
Comprehensive income (loss)	$ (25.8)	$ 29.6	$ (8.7)	$ 53.4

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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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