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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net earnings $ 77.1 $ (5.6) $ (143.8)
Defined benefit pension and other post retirement employee benefits:      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax (2.1) 2.7 (16.0)
Amortization of actuarial loss included in net periodic cost, net of tax of $2.5, $1.9 and $2.4 7.3 5.1 6.8
Amortization of prior service credit included in net periodic cost, net of tax of $—, $—, and $(0.4) 0.0 0.0 1.3
Other comprehensive (loss) income, net of tax 5.2 7.8 (10.5)
Comprehensive income $ 82.3 $ 2.2 $ (154.3)