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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net earnings $ 46.0 $ (28.1) $ 77.1
Defined benefit pension and other postretirement employee benefits:      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 4.7 4.0 (2.1)
Amortization of actuarial loss included in net periodic cost, net of tax of $1.6, $2.7 and $2.5 4.7 7.8 7.3
Other comprehensive (loss) income, net of tax 9.3 11.7 5.2
Comprehensive income $ 55.3 $ (16.3) $ 82.3