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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Schedule of stock compensation expense
The Company recorded stock compensation expense as follows for the three and nine months ended September 30, 2017 and 2016 (in millions):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Cost of goods sold
 
$
0.8

 
$
0.7

 
$
2.4

 
$
1.6

Selling, general and administrative expenses
 
7.9

 
7.2

 
29.1

 
18.0

Total stock compensation expense
 
$
8.7

 
$
7.9

 
$
31.5

 
$
19.6
Schedule of LTIP and Performance Awards activity
Performance award transactions during the nine months ended September 30, 2017 were as follows and are presented as if the Company were to achieve its maximum levels of performance under the plan awards:
Shares awarded but not earned at January 1
1,982,120

Shares awarded
539,598

Shares forfeited or unearned
(217,498
)
Shares earned
—

Shares awarded but not earned at September 30
2,304,220
Schedule of RSU activity
RSU transactions during the nine months ended September 30, 2017 were as follows:
Shares awarded but not vested at January 1
222,730

Shares awarded
111,166

Shares forfeited
(7,107
)
Shares vested
(88,645
)
Shares awarded but not vested at September 30
238,144
Schedule of SARS activity
SSAR transactions during the nine months ended September 30, 2017 were as follows:
SSARs outstanding at January 1
 
1,458,611

SSARs granted
 
286,200

SSARs exercised
 
(645,744
)
SSARs canceled or forfeited
 
(13,850
)
SSARs outstanding at September 30
 
1,085,217