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Short-Term and Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2021
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 June 30, 2021, and December 31, 2020:
June 30, 2021 | Principal |  | Unamortized Debt Issuance Costs |  | Total
Millions |  |  |  |  |
Short-Term Debt | $362.8 |  |  | $(0.2) |  | $362.6 |
Long-Term Debt | 1,673.3 |  |  | (8.7) |  | 1,664.6 |
Total Debt | $2,036.1 |  |  | $(8.9) |  | $2,027.2 |
December 31, 2020 | Principal |  | Unamortized Debt Issuance Costs |  | Total
Millions |  |  |  |  |
Short-Term Debt | $204.0 |  |  | $(0.3) |  | $203.7 |
Long-Term Debt | 1,602.4 |  |  | (9.2) |  | 1,593.2 |
Total Debt | $1,806.4 |  |  | $(9.5) |  | $1,796.9 |

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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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