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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Debt Maturing within One Year
Debt maturing within one year consists of the following:
December 31,
(in Millions)20202019
Short-term foreign debt (1)
$98.4 $144.9 
Commercial paper (2)
146.3 — 
Total short-term debt$244.7 $144.9 
Current portion of long-term debt93.6 82.8 
Short-term debt and current portion of long-term debt$338.3 $227.7 
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(1)    At December 31, 2020, the average effective interest rate on the borrowings was 13.2 percent.
(2)    At December 31, 2020, the average effective interest rate on the borrowings was 0.5 percent.
Schedule of Long-Term Debt
Long-term debt consists of the following:
(in Millions)December 31, 2020December 31,
Interest Rate
Percentage
Maturity
Date
20202019
Pollution control and industrial revenue bonds (less unamortized discounts of $0.1 and $0.2, respectively)
0.30% - 6.50%
2021 - 2032
$51.6 $51.6 
Senior notes (less unamortized discounts of $1.0 and $1.3, respectively)
3.20% - 4.50%
2022 - 2049
2,199.0 2,198.7 
2017 Term Loan Facility1.4%2022700.0 800.0 
Revolving Credit Facility (1)
2.8%2024— — 
Foreign debt
0% - 6.1%
2021 - 2024
92.3 83.8 
Debt issuance cost(19.8)(20.2)
Total long-term debt$3,023.1 $3,113.9 
Less: debt maturing within one year93.6 82.8 
Total long-term debt, less current portion$2,929.5 $3,031.1 
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(1)Letters of credit outstanding under the Revolving Credit Facility totaled $214.1 million and available funds under this facility were $1,139.6 million at December 31, 2020.