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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 17.2	$ 23.8
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial gain included in net periodic cost, net of tax	0.0	(0.1)
Other comprehensive income (loss), net of tax	0.0	(0.1)
Comprehensive income	$ 17.2	$ 23.8

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