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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Reconciliation of information used in computing basic and diluted earnings per share
Basic and diluted earnings per share were computed as follows:
 Years Ended December 31,
(in millions, except per share amounts)202120202019
Earnings from continuing operations$150.2 $2.9 $49.7 
Earnings (loss) from discontinued operations, net0.2 3.7 (0.6)
Net earnings $150.4 $6.6 $49.1 
Basic earnings (loss) per common share:
Earnings from continuing operations$1.63 $0.03 $0.55 
Earnings (loss) from discontinued operations, net— 0.04 (0.01)
Net earnings $1.63 $0.07 $0.54 
Weighted-average shares outstanding 92.3 91.7 91.2 
Diluted earnings (loss) per common share:
Earnings from continuing operations$1.59 $0.03 $0.53 
Earnings (loss) from discontinued operations, net— 0.04 — 
Net earnings $1.59 $0.07 $0.53 
Diluted weighted-average shares outstanding 94.7 92.9 93.4