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Commitments and Contingencies - Purchase Obligations and Employee Relations (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Collective bargaining arrangements  
Unrecorded Unconditional Purchase Obligation $ 85,700,000
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months $ 49,200,000
Percentage of employees represented by labor unions 14.00%
Primary Revolving Credit Facility  
Collective bargaining arrangements  
Long-term Debt $ 900,000