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5. Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
The principal components of long-term debt are as follows (in millions):
March 31,
2021
December 31,
2020
Finance leases and other debt$12.6 $14.1 
Less current maturities(1.7)(1.8)
Long-term debt$10.9 $12.3