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DEBT AND INTEREST (Tables) | 12 Months Ended
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Dec. 31, 2023
DEBT AND INTEREST |
Schedule of short-term debt obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | 2023 | ​ | 2022
​ | ​ | ​ |  | ​ |  | Average |  |  | ​ |  | Average
​ | ​ | ​ | Carrying | ​ | Interest | ​ | Carrying | ​ | Interest
(millions) |  | ​ | Value | ​ | Rate | ​ | Value | ​ | Rate
Short-term debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial paper | ​ | ​ | ​ | $- | ​ | ​ | - | % | ​ | ​ | $- | ​ | ​ | - | %
Notes payable | ​ | ​ |  | 1.8 | ​ | ​ | 8.29 | % | ​ |  | 3.7 | ​ | ​ | 7.28 | %
Long-term debt, current maturities | ​ | ​ |  | 628.6 | ​ | ​ | ​ | ​ | ​ |  | 501.4 | ​ | ​ | ​ | ​
Total | ​ | ​ | ​ | $630.4 | ​ | ​ | ​ | ​ | ​ | ​ | $505.1 | ​ | ​ | ​ | ​
Schedule of long-term debt obligations including current maturities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  |  | 2023 | ​ |  |  | 2022 | ​ |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | Stated | ​ | Effective | ​ | ​ | ​ | ​ | Stated | ​ | Effective
​ | ​ | Maturity | ​ | Carrying | ​ | Interest | ​ | Interest | ​ | Carrying | ​ | Interest | ​ | Interest
(millions) | ​ | by Year | ​ | Value | ​ | Rate | ​ | Rate | ​ | Value | ​ | Rate | ​ | Rate
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public notes (2023 principal amount) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Two year 2021 senior notes ($500 million) | ​ | 2023 | ​ | ​ | $- | ​ | - | % | ​ | - | % | ​ | ​ | $498.7 | ​ | 0.90 | % | ​ | 1.19 | %
Seven year 2016 senior notes (€575 million) | ​ | 2024 | ​ | ​ | 625.9 | ​ | 1.00 | % | ​ | 1.19 | % | ​ | ​ | 596.9 | ​ | 1.00 | % | ​ | 1.03 | %
Ten year 2015 senior notes (€575 million) | ​ | 2025 | ​ |  | 625.1 |  | 2.63 | % | ​ | 2.88 | % | ​ |  | 596.7 |  | 2.63 | % | ​ | 2.81 | %
Ten year 2016 senior notes ($750 million) | ​ | 2026 | ​ | ​ | 728.2 | ​ | 2.70 | % | ​ | 4.07 | % | ​ | ​ | 721.1 | ​ | 2.70 | % | ​ | 3.21 | %
Ten year 2017 senior notes ($500 million) | ​ | 2027 | ​ | ​ | 448.3 | ​ | 3.25 | % | ​ | 8.43 | % | ​ | ​ | 433.9 | ​ | 3.25 | % | ​ | 4.77 | %
Six Year 2021 senior notes ($500 million) | ​ | 2027 | ​ | ​ | 497.4 | ​ | 1.65 | % | ​ | 1.83 | % | ​ | ​ | 496.5 | ​ | 1.65 | % | ​ | 1.83 | %
Five Year 2022 senior notes ($500 million) | ​ | 2028 | ​ | ​ | 494.2 | ​ | 5.25 | % | ​ | 5.60 | % | ​ | ​ | 492.7 | ​ | 5.25 | % | ​ | 5.36 | %
Ten year 2020 senior notes ($698 million) | ​ | 2030 | ​ | ​ | 662.7 | ​ | 4.80 | % | ​ | 6.19 | % | ​ | ​ | 653.5 | ​ | 4.80 | % | ​ | 3.72 | %
Ten year 2020 senior notes ($600 million) | ​ | 2031 | ​ | ​ | 561.0 | ​ | 1.30 | % | ​ | 3.21 | % | ​ | ​ | 555.2 | ​ | 1.30 | % | ​ | 1.70 | %
Eleven year 2021 senior notes ($650 million) | ​ | 2032 | ​ | ​ | 645.2 | ​ | 2.13 | % | ​ | 2.06 | % | ​ | ​ | 644.6 | ​ | 2.13 | % | ​ | 2.24 | %
Thirty year 2011 senior notes ($389 million) | ​ | 2041 | ​ | ​ | 384.7 |  | 5.50 | % | ​ | 5.62 | % | ​ | ​ | 384.5 |  | 5.50 | % | ​ | 5.62 | %
Thirty year 2016 senior notes ($200 million) | ​ | 2046 | ​ | ​ | 197.4 |  | 3.70 | % | ​ | 3.80 | % | ​ | ​ | 197.3 |  | 3.70 | % | ​ | 3.81 | %
Thirty year 2017 senior notes ($484 million) | ​ | 2047 | ​ | ​ | 426.8 | ​ | 3.95 | % | ​ | 4.79 | % | ​ | ​ | 425.5 | ​ | 3.95 | % | ​ | 4.79 | %
Thirty year 2020 senior notes ($500 million) | ​ | 2050 | ​ | ​ | 491.1 | ​ | 2.13 | % | ​ | 2.23 | % | ​ | ​ | 490.7 | ​ | 2.13 | % | ​ | 2.23 | %
Thirty year 2021 senior notes ($850 million) | ​ | 2051 | ​ | ​ | 839.3 | ​ | 2.70 | % | ​ | 2.78 | % | ​ | ​ | 838.9 | ​ | 2.70 | % | ​ | 2.78 | %
Thirty-four year 2021 senior notes ($685 million) | ​ | 2055 | ​ | ​ | 539.2 | ​ | 2.75 | % | ​ | 3.86 | % | ​ | ​ | 537.2 | ​ | 2.75 | % | ​ | 3.86 | %
Finance lease obligations and other | ​ | ​ | ​ |  | 13.5 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 12.8 | ​ | ​ | ​ | ​ | ​ | ​
Total debt | ​ | ​ | ​ |  | 8,180.0 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 8,576.7 | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt, current maturities | ​ | ​ | ​ |  | (628.6) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (501.4) | ​ | ​ | ​ | ​ | ​ | ​
Total long-term debt | ​ | ​ | ​ | ​ | $7,551.4 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $8,075.3 | ​ | ​ | ​ | ​ | ​ | ​
Schedule of aggregate annual maturities of long-term debt | ​
​ | ​ | ​ | ​
(millions) |  | ​ |
2024 | ​ | ​ | $629
2025 | ​ |  | 634
2026 | ​ |  | 729
2027 | ​ |  | 946
2028 | ​ |  | 495
Schedule of interest expense and interest income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(millions) | ​ | 2023 |  | 2022 |  | 2021
Interest expense | ​ | ​ | $348.9 | ​ | ​ | ​ | $252.1 | ​ | ​ | ​ | $230.6 | ​
Interest income |  |  | (52.2) | ​ | ​ |  | (8.5) | ​ | ​ |  | (12.3) | ​
Interest expense, net | ​ | ​ | $296.7 | ​ | ​ | ​ | $243.6 | ​ | ​ | ​ | $218.3 | ​

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