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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net earnings $ 150.4 $ 6.6 $ 49.1
Other comprehensive earnings (loss), net of tax      
Foreign currency translation (3.6) 13.8 1.3
Employee benefit plans:      
Actuarial gains (losses) and prior service costs arising during period 4.3 (4.0) (3.7)
Amortization or settlement of actuarial losses and prior service costs 0.7 0.6 0.5
Net change in employee benefit plans 5.0 (3.4) (3.2)
Changes in fair value of cash flow hedges:      
Unrealized net gains (losses) arising during period 0.3 2.0 0.2
Net (gains) losses reclassified into earnings (1.6) (0.9) 0.7
Total cash flow hedges (1.3) 1.1 0.9
Other comprehensive earnings (loss), net of tax 0.1 11.5 (1.0)
Comprehensive earnings $ 150.5 $ 18.1 $ 48.1