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

 
March 31,
2018
 
December 31,
2017
4.875% Senior Notes due 2020 principal amount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(1.8
)
 
(1.9
)
Long-term debt less unamortized discount and debt issuance costs
423.2

 
423.1

Capital leases and other debt
11.9

 
11.9

 
435.1

 
435.0

Less current maturities
(0.4
)
 
(0.4
)
Long-term debt
$
434.7

 
$
434.6