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Debt (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | Total amortized cost of Long-term Debt outstanding at June 30, 2020 and December 31, 2019 was:
(Dollars in Millions) |  | Jun 30, 2020 |  | Dec 31, 2019
Term Loan due July 5, 2023 |  | $ | 49.9 |  |  | $ | 49.9 |
5.0% Senior Notes due September 19, 2022 |  | 279.1 |  |  | 279.9 |
4.35% Senior Notes due February 15, 2025 |  | 448.7 |  |  | 448.6 |
Total Long-term Debt Outstanding |  | $ | 777.7 |  |  | $ | 778.4 |

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