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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2022
Debt Disclosure [Abstract] |
Long-Term Debt |
|  | March 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
|  | (Dollars in Millions) |
0.650% Senior Notes, due 2023 |  | $ | 697.8 |  |  | $ | 697.4 |
4.250% Senior Notes, due 2024 |  |  | 398.4 |  |  |  | 398.3 |
7% Debentures, due 2025 |  |  | 124.6 |  |  |  | 124.6 |
3.450% Senior Notes, due 2027 |  |  | 298.0 |  |  |  | 297.9 |
3.500% Senior Notes, due 2027 |  |  | 496.5 |  |  |  | 496.4 |
2.500% Senior Notes, due 2030 |  |  | 491.4 |  |  |  | 491.1 |
2.400% Senior Notes, due 2031 |  |  | 892.1 |  |  |  | 891.8 |
6.25% Senior Notes, due 2037 |  |  | 228.3 |  |  |  | 228.3 |
4.250% Senior Notes, due 2047 |  |  | 592.1 |  |  |  | 592.1 |
3.200% Senior Notes, due 2051 |  |  | 883.1 |  |  |  | 882.9 |
Other notes |  |  | 0.1 |  |  |  | 0.1 |
Total debt |  |  | 5,102.4 |  |  |  | 5,100.9 |
Less: Current maturities |  |  | (0.1 | ) |  |  | (0.1 | )
Long-term debt |  | $ | 5,102.3 |  |  | $ | 5,100.8 |

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