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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Reconciliation of information used in computing basic and diluted earnings per share Basic and diluted earnings per share was computed as follows:
 
Years Ended December 31,
(in millions, except share and per share amounts)
2018
 
2017
 
    2016
Earnings from continuing operations
$
65.6

 
$
6.5

 
$
19.8

Earnings (loss) from discontinued operations, net
2.1

 
61.8

 
(62.1
)
Net earnings (loss)
$
67.7

 
$
68.3

 
$
(42.3
)
 
 
 
 
 
 
Basic earnings (loss) per common share:
 
 
 
 
 
Earnings from continuing operations
$
0.73

 
$
0.07

 
$
0.22

Earnings (loss) from discontinued operations, net
0.02

 
0.69

 
(0.70
)
Net earnings (loss)
$
0.75

 
$
0.76

 
$
(0.48
)
 
 
 
 
 
 
Weighted-average shares outstanding
90,050,051

 
89,329,794

 
88,667,098

 
 
 
 
 
 
Diluted earnings (loss) per common share:
 
 
 
 
 
Earnings from continuing operations
$
0.72

 
$
0.07

 
$
0.22

Earnings (loss) from discontinued operations, net
0.02

 
0.68

 
(0.69
)
Net earnings (loss)
$
0.74

 
$
0.75

 
$
(0.47
)
 
 
 
 
 
 
Diluted weighted-average shares outstanding
91,194,747

 
90,490,007

 
89,182,967