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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 36.6	$ 20.6	$ 90.1	$ 51.9
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial (gain) loss included in net periodic cost, net of tax of $0.0, $0.4, $0.1 and $1.2	(0.1)	1.1	(0.2)	3.5
Other comprehensive income (loss), net of tax	(0.1)	1.1	(0.2)	3.5
Comprehensive income	$ 36.6	$ 21.8	$ 89.9	$ 55.4

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