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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Compensation Expense The Company recorded stock compensation expense as follows for the three and nine months ended September 30, 2021 and 2020 (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Cost of goods sold$0.2 $0.5 $0.8 $0.9 
Selling, general and administrative expenses5.8 13.7 20.5 26.3 
Total stock compensation expense$6.0 $14.2 $21.3 $27.2 
Schedule Performance Awards Activity Performance award transactions during the nine months ended September 30, 2021 are presented as if the Company were to achieve its maximum levels of performance and assume the 2021 performance awards subject to the total shareholder return modifier are achieved at target levels under the plan awards, and were as follows:
Shares awarded but not earned at January 1582,952 
Shares awarded281,310 
Shares forfeited(12,238)
Shares vested(142)
Shares awarded but not earned at September 30851,882 
Schedule of RSU Activity RSU transactions during the nine months ended September 30, 2021 assume the 2020 RSUs subject to the total shareholder return modifier are achieved at target levels, and were as follows:
RSUs awarded but not vested at January 1143,287 
RSUs awarded92,848 
RSUs forfeited(2,226)
RSUs vested(63,397)
RSUs awarded but not vested at September 30170,512 
Schedule of SARS Activity SSAR transactions during the nine months ended September 30, 2021 were as follows:
SSARs outstanding at January 1403,150 
SSARs granted— 
SSARs exercised(192,011)
SSARs canceled or forfeited(904)
SSARs outstanding at September 30210,235