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5. Notes Payable and Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 |  | December 31, 2015
4.875% Senior Notes due 2020, net of discount | $ | 425.0 |  |  | $ | 425.0 |
Less unamortized discount and debt issuance costs | (2.5 | ) |  | (3.1 | )
Long-term debt less unamortized discount and debt issuance costs | 422.5 |  |  | 421.9 |
Capital leases and other debt | 12.0 |  |  | 12.3 |
| 434.5 |  |  | 434.2 |
Less current maturities | (0.3 | ) |  | (0.3 | )
Long-term debt | $ | 434.2 |  |  | $ | 433.9 |

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