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Debt (Tables)
 3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Debt maturing within one year
Debt maturing within one year:
(in Millions)March 31, 2020December 31, 2019
Short-term foreign debt (1)
$186.3  $144.9  
Total short-term debt$186.3  $144.9  
Current portion of long-term debt63.9  82.8  
Total short-term debt and current portion of long-term debt$250.2  $227.7  
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(1) At March 31, 2020, the average effective interest rate on the borrowings was 13.6 percent.
Schedule of long-term debt
Long-term debt:
(in Millions)March 31, 2020  
Interest Rate PercentageMaturity
Date		March 31, 2020December 31, 2019
Pollution control and industrial revenue bonds (less unamortized discounts of $0.1 and $0.2, respectively)
4.0% - 6.5%
2021 - 2032
$51.7  $51.6  
Senior notes (less unamortized discount of $1.2 and $1.3, respectively)
3.2% - 4.5%
2022 - 2049
2,198.8  2,198.7  
2017 Term Loan Facility2.2%2022800.0  800.0  
Revolving Credit Facility (1)
1.9%2024500.0  —  
Foreign debt
0% - 7.2%
2020 - 2024
64.6  83.8  
Debt issuance cost(19.4) (20.2) 
Total long-term debt$3,595.7  $3,113.9  
Less: debt maturing within one year63.9  82.8  
Total long-term debt, less current portion$3,531.8  $3,031.1  
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(1)Letters of credit outstanding under our Revolving Credit Facility totaled $215.1 million and available funds under this facility were $784.9 million at March 31, 2020.