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5. Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
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,
2018
 
December 31,
2017
4.875% Senior Notes due 2020 principal amount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(1.6
)
 
(1.9
)
4.875% Senior Notes less unamortized discount and debt issuance costs
423.4

 
423.1

Capital leases and other debt
17.1

 
11.9

 
440.5

 
435.0

Less current maturities
(1.7
)
 
(0.4
)
Long-term debt
$
438.8

 
$
434.6