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6. Long-Term Debt (Tables)
6 Months Ended
Jun. 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):
June 30,
2020
December 31,
2019
4.875% Senior Notes due 2020 principal amount$425.0  $425.0  
Less unamortized discount and debt issuance costs(0.3) (0.6) 
4.875% Senior Notes less unamortized discount and debt issuance costs424.7  424.4  
Finance leases and other debt14.0  15.4  
 438.7  439.8  
Less current maturities(426.5) (426.2) 
Long-term debt$12.2  $13.6