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Selected Quarterly Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
($ in millions, except per share data)1st Quarter2nd Quarter3rd Quarter4th Quarter
2020:
Sales$547.2 $362.0 $640.5 $732.3 
Gross profit$278.4 $150.5 $340.7 $388.5 
Net income$(17.2)$(93.5)$35.6 $108.4 
Net earnings per share:
Basic$(0.11)$(0.59)$0.22 $0.68 *
Diluted$(0.11)$(0.59)$0.22 $0.64 *
2019:
Sales$659.7 $712.1 $659.3 $720.5 
Gross profit$363.1 $393.6 $367.0 $389.4 
Net income$37.9 $61.5 $62.1 $56.1 
Net earnings per share:
Basic$0.30 $0.48 $0.48 $0.35 *
Diluted$0.30 $0.48 $0.48 $0.35 *
* Earnings per share is computed independently for each of the periods presented. The sum of the quarterly earnings per share do not equal the total earnings per share computed for the year due to rounding or due to net losses in the first and second quarters of 2020, which exclude the dilutive impact of stock-based awards for those quarters.