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Debt (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Debt maturing within one year
Debt maturing within one year:

(in Millions)March 31, 2021December 31, 2020
Short-term foreign debt (1)
$102.4 $98.4 
Commercial paper (2)
486.9 146.3 
Total short-term debt$589.3 $244.7 
Current portion of long-term debt385.1 93.6 
Total short-term debt and current portion of long-term debt$974.4 $338.3 
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(1)    At March 31, 2021, the average effective interest rate on the borrowings was 12.0 percent.
(2)    At March 31, 2021, the average effective interest rate on the borrowings was 0.51 percent.
Schedule of long-term debt
Long-term debt:
(in Millions)March 31, 2021  
Interest Rate PercentageMaturity
Date
March 31, 2021December 31, 2020
Pollution control and industrial revenue bonds (less unamortized discounts of $0.1 and $0.1, respectively)
0.25% - 6.45%
2021 - 2032
$51.6 $51.6 
Senior notes (less unamortized discount of $0.9 and $1.0, respectively)
3.2% - 4.5%
2022 - 2049
2,199.1 2,199.0 
2017 Term Loan Facility1.36%2022700.0 700.0 
Revolving Credit Facility (1)
2.8%2024— — 
Foreign debt
0% - 6.1%
2021 - 2024
84.0 92.3 
Debt issuance cost(18.2)(19.8)
Total long-term debt$3,016.5 $3,023.1 
Less: debt maturing within one year385.1 93.6 
Total long-term debt, less current portion$2,631.4 $2,929.5 
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(1)Letters of credit outstanding under our Revolving Credit Facility totaled $215.7 million and available funds under this facility were $797.3 million at March 31, 2021.