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401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2020
Postemployment Benefits [Abstract]  
Schedule of Long-term Incentive Plan
The following is a summary related to our SERP:
Year Ended December 31,
(Dollars in millions)202020192018
Compensation expense$1.2 $0.9 $1.3 
Total discretionary contribution$0.9 $0.3 $0.8 
Guaranteed annual return5.00 %5.00 %5.00 %