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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 14.7	$ (51.6)	$ 31.3	$ (39.6)
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial loss included in net periodic cost, net of tax of $0.4, $0.7, $0.8, and $1.3	1.1	1.9	2.3	3.8
Other comprehensive income (loss), net of tax	1.1	1.9	2.3	3.8
Comprehensive income	$ 15.8	$ (49.7)	$ 33.6	$ (35.8)

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