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Share-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule about share-based compensation expense The second quarter information is presented below:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Share-based Compensation Expense
2017
 
2016
 
2017
 
2016
Stock options
$
0.2

 
$
0.1

 
$
1.7

 
$
0.6

Restricted stock
0.4

 
0.3

 
2.3

 
1.1

Restricted stock units issued to Directors
0.3

 
0.4

 
0.7

 
0.7

Performance shares
0.4

 
0.4

 
0.8

 
0.8

Total share-based compensation expense
$
1.3

 
$
1.2

 
$
5.5

 
$
3.2