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Earnings per Share ("EPS") (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
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,
 
 
2017
 
2016
 
2015
Income from continuing operations
 
$
80.3

 
$
73.4

 
$
60.5

Amounts attributable to participating securities
 
(0.6
)
 
(0.7
)
 
(0.6
)
Income from continuing operations available to common stockholders
 
79.7

 
72.7

 
59.9

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

 
(0.4
)
 
(9.4
)
Amounts attributable to participating securities
 
—

 
—

 
0.1

Net income available to common stockholders
 
$
79.7

 
$
72.3

 
$
50.6

Weighted-average basic shares outstanding
 
16,805

 
16,773

 
16,754

Basic earnings (loss) per share
 
 

 
 

 
 

Continuing operations
 
$
4.74

 
$
4.33

 
$
3.58

Discontinued operations
 
—

 
(0.02
)
 
(0.56
)
 
 
$
4.74

 
$
4.31

 
$
3.02


Earnings per diluted common share
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Income from continuing operations
 
$
80.3

 
$
73.4

 
$
60.5

Amounts attributable to participating securities
 
(0.5
)
 
(0.6
)
 
(0.5
)
Income from continuing operations available to common stockholders
 
79.8

 
72.8

 
60.0

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

 
(0.4
)
 
(9.4
)
Amounts attributable to participating securities
 
—

 
—

 
0.1

Net income available to common stockholders
 
$
79.8

 
$
72.4

 
$
50.7

Weighted-average basic shares outstanding
 
16,805

 
16,773

 
16,754

Add: Assumed incremental shares under stock-based compensation plans
 
247

 
314

 
258

Weighted average diluted shares
 
17,052

 
17,087

 
17,012

Diluted earnings (loss) per share
 
 

 
 

 
 

Continuing operations
 
$
4.68

 
$
4.26

 
$
3.53

Discontinued operations
 
—

 
(0.02
)
 
(0.55
)
 
 
$
4.68

 
$
4.24

 
$
2.98