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6. Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2016
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,
2016
 
December 31, 2015
4.875% Senior Notes due 2020 principal amount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(3.0
)
 
(3.1
)
Long-term debt less unamortized discount and debt issuance costs
422.0

 
421.9

Capital leases and other debt
12.3

 
12.3

 
434.3

 
434.2

Less current maturities
(0.3
)
 
(0.3
)
Long-term debt
$
434.0

 
$
433.9