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Earnings Per Share
9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table sets forth the computation of basic and diluted net earnings per share (dollars and shares in millions, except per share amounts):
Three Months EndedNine Months Ended
 September 30,September 30,
2020201920202019
Earnings
Net income$23.0 $22.5 $44.2 $41.5 
Shares
Weighted-average common shares outstanding
(basic shares)
45.1 45.8 45.1 45.8 
Adjustment for assumed dilution:
Restricted stock units0.2 0.2 0.1 0.2 
Performance shares0.1 0.1 0.1 0.1 
Weighted-average shares assuming dilution
(diluted shares)
45.4 46.1 45.3 46.1 
Earnings per share
Basic(1)
$0.51 $0.49 $0.98 $0.91 
Diluted(1)
$0.51 $0.49 $0.98 $0.90 
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(1)    Basic and diluted earnings per share are calculated based on unrounded actual amounts.
The number of common shares that were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive were 10,279 and 263,983 for the three and nine months ended September 30, 2020, respectively, and 10,279 and 205,748, for the same periods in 2019, respectively.