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Earnings per Share (Notes)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings per Share Basic and diluted earnings per share were computed as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions, except share and per share amounts)
2018
 
2017
 
2018
 
2017
(Loss) earnings from continuing operations
$
(17.8
)
 
$
10.5

 
$
(13.8
)
 
$
(25.4
)
Earnings from discontinued operations, net
1.6

 
5.2

 
1.9

 
8.2

Net (loss) earnings
$
(16.2
)
 
$
15.7

 
$
(11.9
)
 
$
(17.2
)
 
 
 
 
 
 
 
 
Basic (loss) earnings per common share:
 
 
 
 
 
 
 
(Loss) earnings from continuing operations
$
(0.20
)
 
$
0.12

 
$
(0.15
)
 
$
(0.28
)
Earnings from discontinued operations, net
0.02

 
0.06

 
0.02

 
0.09

Net (loss) earnings
$
(0.18
)
 
$
0.18

 
$
(0.13
)
 
$
(0.19
)
 
 
 
 
 
 
 
 
Weighted-average shares outstanding
90,171,928

 
89,469,996

 
89,988,254

 
89,270,103

 
 
 
 
 
 
 
 
Diluted (loss) earnings per common share:
 

 
 

 
 
 
 
(Loss) earnings from continuing operations
$
(0.20
)
 
$
0.12

 
$
(0.15
)
 
$
(0.28
)
Earnings from discontinued operations, net
0.02

 
0.05

 
0.02

 
0.09

Net (loss) earnings
$
(0.18
)
 
$
0.17

 
$
(0.13
)
 
$
(0.19
)
 
 
 
 
 
 
 
 
Diluted weighted-average shares outstanding
90,171,928

 
90,373,112

 
89,988,254

 
89,270,103



For the three and nine months ended September 30, 2018, the weighted-average number of anti-dilutive potential common shares excluded from the diluted earnings per share calculation above was 5,658,260 and 5,365,031, respectively. For the three and nine months ended September 30, 2017, the weighted-average number of anti-dilutive potential common shares excluded from the diluted earnings per share calculation above was 4,092,338 and 5,067,013, respectively.