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6. Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2015
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,
2015
 
December 31, 2014
4.875% Senior Notes due 2020, net of discount
$
423.6

 
$
423.5

Capital leases and other debt
12.4

 
12.5

 
436.0

 
436.0

Less current maturities
(0.3
)
 
(0.3
)
Long-term debt
$
435.7

 
$
435.7