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Earnings per Share (Notes)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
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 
As the Company intends to settle the principal amount of the Notes in cash, the treasury stock method was used to calculate any potential dilutive effect of the conversion option on diluted earnings per share, if applicable. For the three and six months ended June 30, 2021, the weighted-average number of anti-dilutive potential common shares excluded from the diluted earnings per share calculation above was 583,650 and 1,391,641, respectively. For the three and six months ended June 30, 2020, the weighted-average number of anti-dilutive potential common shares excluded from the diluted earnings per share calculation above was 6,157,127 and 5,176,141, respectively.