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Short-Term and Long-Term Debt (Tables)
3 Months Ended
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, 2021PrincipalUnamortized Debt Issuance CostsTotal
Millions  
Short-Term Debt$298.8 $(0.3)$298.5 
Long-Term Debt1,661.3 (8.9)1,652.4 
Total Debt$1,960.1 $(9.2)$1,950.9 
December 31, 2020PrincipalUnamortized Debt Issuance CostsTotal
Millions  
Short-Term Debt $204.0 $(0.3)$203.7 
Long-Term Debt1,602.4 (9.2)1,593.2 
Total Debt$1,806.4 $(9.5)$1,796.9