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Special Charges (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Liability
December 31,
2019
Year Ended 
December 31, 2020
Liability
December 31,
2020
Charges (Credits) for Termination BenefitsPaid
Workforce reductions:
Corporate functions
$1.2 $0.6 $(1.8)$— 
Piketon facility
0.2 — (0.2)— 
Total$1.4 $0.6 $(2.0)$