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6. Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 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):

 
March 31,
2020
 
December 31,
2019
4.875% Senior Notes due 2020 principal amount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(0.5
)
 
(0.6
)
4.875% Senior Notes less unamortized discount and debt issuance costs
424.5

 
424.4

Finance leases and other debt
14.0

 
15.4

 
438.5

 
439.8

Less current maturities
(426.3
)
 
(426.2
)
Long-term debt
$
12.2

 
$
13.6