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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of stock compensation expense The Company recorded stock compensation expense as follows for the three months ended March 31, 2021 and 2020 (in millions):
Three Months Ended March 31,
20212020
Cost of goods sold$0.3 $0.1 
Selling, general and administrative expenses6.5 2.5 
Total stock compensation expense$6.8 $2.6 
Schedule of LTIP and Performance Awards activity Performance award transactions during the three months ended March 31, 2021 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 1582,952 
Shares awarded269,508 
Shares forfeited(1,660)
Shares earned(142)
Shares awarded but not earned at March 31850,658 
Schedule of RSU activity RSU transactions during the three months ended March 31, 2021 were as follows:
RSUs awarded but not vested at January 1143,287 
RSUs awarded89,775 
RSUs forfeited(349)
RSUs vested(63,280)
RSUs awarded but not vested at March 31169,433 
Schedule of SARS activity SSAR transactions during the three months ended March 31, 2021 were as follows:
SSARs outstanding at January 1403,150 
SSARs granted— 
SSARs exercised(103,776)
SSARs canceled or forfeited(754)
SSARs outstanding at March 31298,620