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6. Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2017
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,
2017
 
December 31, 2016
4.875% Senior Notes due 2020 principal amount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(2.1
)
 
(2.5
)
Long-term debt less unamortized discount and debt issuance costs
422.9

 
422.5

Capital leases and other debt
12.1

 
12.0

 
435.0

 
434.5

Less current maturities
(0.5
)
 
(0.3
)
Long-term debt
$
434.5

 
$
434.2