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6. Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 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):

 
June 30,
2016
 
December 31, 2015
4.875% Senior Notes due 2020 principal amount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(2.8
)
 
(3.1
)
Long-term debt less unamortized discount and debt issuance costs
422.2

 
421.9

Capital leases and other debt
12.2

 
12.3

 
434.4

 
434.2

Less current maturities
(0.3
)
 
(0.3
)
Long-term debt
$
434.1

 
$
433.9