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DEBT AND INTEREST (Tables) | 6 Months Ended
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Jun. 30, 2024
DEBT AND INTEREST |
Schedule of short-term debt obligations | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30 | ​ | December 31
(millions) |  | 2024 | ​ | 2023
Short-term debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Notes payable | ​ | ​ | $3.5 | ​ | ​ | ​ | $1.8 | ​
Long-term debt, current maturities | ​ | ​ | 2.4 | ​ | ​ | ​ | 628.6 | ​
Total | ​ | ​ | $5.9 | ​ | ​ | ​ | $630.4 | ​
Schedule of long-term debt obligations including current maturities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  |  |  | ​ | ​ |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Maturity | ​ | June 30 | ​ | December 31
(millions) | ​ | by Year | ​ | 2024 | ​ | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Public notes (2024 principal amount) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Seven year 2016 senior notes (€575 million) | ​ | 2024 | ​ | ​ | $- | ​ | ​ | ​ | $625.9 | ​
Ten year 2015 senior notes (€575 million) | ​ | 2025 | ​ | ​ | 623.1 | ​ | ​ | ​ | 625.1 | ​
Ten year 2016 senior notes ($750 million) | ​ | 2026 | ​ | ​ | 728.5 | ​ | ​ | ​ | 728.2 | ​
Ten year 2017 senior notes ($500 million) | ​ | 2027 | ​ | ​ | 445.6 | ​ | ​ | ​ | 448.3 | ​
Six Year 2021 senior notes ($500 million) | ​ | 2027 | ​ | ​ | 497.8 | ​ | ​ | ​ | 497.4 | ​
Five Year 2022 senior notes ($500 million) | ​ | 2028 | ​ | ​ | 494.9 | ​ | ​ | ​ | 494.2 | ​
Ten year 2020 senior notes ($698 million) | ​ | 2030 | ​ | ​ | 652.5 | ​ | ​ | ​ | 662.7 | ​
Ten year 2020 senior notes ($600 million) | ​ | 2031 | ​ | ​ | 556.6 | ​ | ​ | ​ | 561.0 | ​
Eleven year 2021 senior notes ($650 million) | ​ | 2032 | ​ | ​ | 645.5 | ​ | ​ | ​ | 645.2 | ​
Thirty year 2011 senior notes ($389 million) | ​ | 2041 | ​ | ​ | 384.9 | ​ | ​ | ​ | 384.7 | ​
Thirty year 2016 senior notes ($200 million) | ​ | 2046 | ​ | ​ | 197.4 | ​ | ​ | ​ | 197.4 | ​
Thirty year 2017 senior notes ($484 million) | ​ | 2047 | ​ | ​ | 427.5 | ​ | ​ | ​ | 426.8 | ​
Thirty year 2020 senior notes ($500 million) | ​ | 2050 | ​ | ​ | 491.2 | ​ | ​ | ​ | 491.1 | ​
Thirty year 2021 senior notes ($850 million) | ​ | 2051 | ​ | ​ | 839.5 | ​ | ​ | ​ | 839.3 | ​
Thirty-four year 2021 senior notes ($685 million) | ​ | 2055 | ​ | ​ | 540.2 | ​ | ​ | ​ | 539.2 | ​
Finance lease obligations and other | ​ | ​ | ​ | ​ | 16.0 | ​ | ​ | ​ | 13.5 | ​
Total debt | ​ | ​ | ​ | ​ | 7,541.2 | ​ | ​ | ​ | 8,180.0 | ​
Long-term debt, current maturities | ​ | ​ | ​ | ​ | (2.4) | ​ | ​ | ​ | (628.6) | ​
Total long-term debt | ​ | ​ | ​ | ​ | $7,538.8 | ​ | ​ | ​ | $7,551.4 | ​
Schedule of interest expense and interest income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Second Quarter Ended | ​ | Six Months Ended | ​
​ | ​ | June 30 | ​ | June 30 | ​
(millions) |  | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023 | ​
Interest expense | ​ | ​ | $80.2 | ​ | ​ | ​ | $82.7 | ​ | ​ | $174.7 | ​ | ​ | ​ | $162.8 | ​
Interest income |  | ​ | (1.4) | ​ | ​ | ​ | (4.9) |  | ​ | (24.3) | ​ | ​ | ​ | (10.8) |
Interest expense, net | ​ | ​ | $78.8 | ​ | ​ | ​ | $77.8 | ​ | ​ | $150.4 | ​ | ​ | ​ | $152.0 | ​

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