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6. Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
The principal components of long-term debt are as follows (in millions):
September 30,
2020
December 31,
2019
4.875% Senior Notes due 2020 principal amount$425.0 $425.0 
Less unamortized discount and debt issuance costs(0.1)(0.6)
4.875% Senior Notes less unamortized discount and debt issuance costs424.9 424.4 
Finance leases and other debt13.9 15.4 
 438.8 439.8 
Less current maturities(426.6)(426.2)
Long-term debt$12.2 $13.6