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5. Notes Payable and Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Principal components of long-term debt [Table Text Block] The principal components of long-term debt are as follows (in millions):
 
December 31,
2017
 
December 31, 2016
 
 
 
 
4.875% Senior Notes due 2020, net of discount
$
425.0

 
$
425.0

Less unamortized discount and debt issuance costs
(1.9
)
 
(2.5
)
Long-term debt less unamortized discount and debt issuance costs
423.1

 
422.5

Capital leases and other debt
11.9

 
12.0

 
435.0

 
434.5

Less current maturities
(0.4
)
 
(0.3
)
Long-term debt
$
434.6

 
$
434.2