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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Debt maturing within one year
Debt maturing within one year:
(in Millions)June 30, 2020December 31, 2019
Short-term foreign debt (1)
$182.4  $144.9  
Commercial paper (2)
243.1  —  
Total short-term debt$425.5  $144.9  
Current portion of long-term debt80.4  82.8  
Total short-term debt and current portion of long-term debt$505.9  $227.7  
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(1) At June 30, 2020, the average effective interest rate on the borrowings was 11.0 percent.
(2)  At June 30, 2020, the average effective interest rate on the borrowings was 1.1 percent.
Schedule of long-term debt
Long-term debt:
(in Millions)June 30, 2020  
Interest Rate PercentageMaturity
Date		June 30, 2020December 31, 2019
Pollution control and industrial revenue bonds (less unamortized discounts of $0.1 and $0.2, respectively)
0.3% - 6.5%
2021 - 2032
$51.7  $51.6  
Senior notes (less unamortized discount of $1.1 and $1.3, respectively)
3.2% - 4.5%
2022 - 2049
2,198.9  2,198.7  
2017 Term Loan Facility1.4%2022800.0  800.0  
Revolving Credit Facility (1)
2.8%2024—  —  
Foreign debt
0% - 6.1%
2020 - 2024
79.0  83.8  
Debt issuance cost(21.7) (20.2) 
Total long-term debt$3,107.9  $3,113.9  
Less: debt maturing within one year80.4  82.8  
Total long-term debt, less current portion$3,027.5  $3,031.1  
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(1)Letters of credit outstanding under our Revolving Credit Facility totaled $215.3 million and available funds under this facility were $1,041.6 million at June 30, 2020.