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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 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:
 Three Months Ended June 30, Six Months Ended June 30,
(in millions, except share and per share amounts)2021202020212020
Earnings (loss) from continuing operations$17.4 $(19.5)$29.9 $(32.3)
Earnings from discontinued operations, net0.2 — 0.2 3.7 
Net earnings (loss)$17.6 $(19.5)$30.1 $(28.6)
Basic earnings (loss) per common share:
Earnings (loss) from continuing operations$0.19 $(0.21)$0.32 $(0.35)
Earnings from discontinued operations, net— — 0.01 0.04 
Net earnings (loss)$0.19 $(0.21)$0.33 $(0.31)
Weighted-average shares outstanding92,493,220 91,589,156 92,379,097 91,721,440 
Diluted earnings (loss) per common share:  
Earnings (loss) from continuing operations$0.18 $(0.21)$0.31 $(0.35)
Earnings from discontinued operations, net0.01 — 0.01 0.04 
Net earnings (loss)$0.19 $(0.21)$0.32 $(0.31)
Diluted weighted-average shares outstanding94,905,503 91,589,156 95,048,241 91,721,440