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Short-Term and Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2021, and December 31, 2020:
March 31, 2021 | Principal |  | Unamortized Debt Issuance Costs |  | Total
Millions |  |  |  |  |
Short-Term Debt | $298.8 |  |  | $(0.3) |  | $298.5 |
Long-Term Debt | 1,661.3 |  |  | (8.9) |  | 1,652.4 |
Total Debt | $1,960.1 |  |  | $(9.2) |  | $1,950.9 |
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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