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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 16.6	$ 12.1
Defined benefit pension and other postretirement employee benefits:
Amortization of actuarial loss included in net periodic cost, net of tax of $0.4 and $0.7	1.1	1.9
Other comprehensive income (loss), net of tax	1.1	1.9
Comprehensive income	$ 17.7	$ 14.0

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