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5. Notes Payable and Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Principal components of long-term debt [Table Text Block]
The principal components of long-term debt are as follows (in millions):
December 31, 2020December 31, 2019
4.875% Senior Notes due 2020, net of discount$— $425.0 
Less unamortized discount and debt issuance costs— (0.6)
Long-term debt less unamortized discount and debt issuance costs— 424.4 
Finance leases and other debt14.1 15.4 
 14.1 439.8 
Less current maturities(1.8)(426.2)
Long-term debt$12.3 $13.6