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Earnings per Share ("EPS") (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table presents the computation of basic and diluted shares of common stock used in the calculation of EPS (amounts in millions, except share and per share amounts):
Earnings per basic common share
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Income from continuing operations
 
$
37.2

 
$
80.3

 
$
73.4

Amounts attributable to participating securities
 
(0.2
)
 
(0.6
)
 
(0.7
)
Income from continuing operations available to common stockholders
 
37.0

 
79.7

 
72.7

Income (loss) from discontinued operations, net of income taxes
 
(0.8
)
 
—

 
(0.4
)
Amounts attributable to participating securities
 
—

 
—

 
—

Net income available to common stockholders
 
$
36.2

 
$
79.7

 
$
72.3

Weighted-average basic shares outstanding
 
16,850

 
16,805

 
16,773

Basic earnings (loss) per share
 
 

 
 

 
 

Continuing operations
 
$
2.20

 
$
4.74

 
$
4.33

Discontinued operations
 
(0.05
)
 
—

 
(0.02
)
 
 
$
2.15

 
$
4.74

 
$
4.31


Earnings per diluted common share
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Income from continuing operations
 
$
37.2

 
$
80.3

 
$
73.4

Amounts attributable to participating securities
 
(0.4
)
 
(0.5
)
 
(0.6
)
Income from continuing operations available to common stockholders
 
36.8

 
79.8

 
72.8

Income (loss) from discontinued operations, net of income taxes
 
(0.8
)
 
—

 
(0.4
)
Amounts attributable to participating securities
 
—

 
—

 
—

Net income available to common stockholders
 
$
36.0

 
$
79.8

 
$
72.4

Weighted-average basic shares outstanding
 
16,850

 
16,805

 
16,773

Add: Assumed incremental shares under stock-based compensation plans
 
118

 
247

 
314

Weighted average diluted shares
 
16,968

 
17,052

 
17,087

Diluted earnings (loss) per share
 
 

 
 

 
 

Continuing operations
 
$
2.17

 
$
4.68

 
$
4.26

Discontinued operations
 
(0.05
)
 
—

 
(0.02
)
 
 
$
2.12

 
$
4.68

 
$
4.24