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Short-Term and Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Short-Term and Long-Term Debt [Table Text Block] | The following tables present the Company’s short-term and long-term debt as of March 31, 2018, and December 31, 2017:
March 31, 2018 | Principal |  |  | Unamortized Debt Issuance Costs |  | Total |
Millions |  |  |  |  |
Short-Term Debt |  | $106.6 |  |  | $(0.4) |  |  | $106.2 |
Long-Term Debt | 1,405.6 |  |  | (9.1) |  | 1,396.5 |
Total Debt |  | $1,512.2 |  |  | $(9.5) |  |  | $1,502.7 |
December 31, 2017 | Principal |  |  | Unamortized Debt Issuance Costs |  | Total |
Millions |  |  |  |  |
Short-Term Debt |  | $64.6 |  |  | $(0.5) |  |  | $64.1 |
Long-Term Debt | 1,448.7 |  |  | (9.5) |  | 1,439.2 |
Total Debt |  | $1,513.3 |  |  | $(10.0) |  |  | $1,503.3 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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