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DEBT AND FINANCING ARRANGEMENTS (Tables) | 9 Months Ended
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Sep. 30, 2018
Details on Long Term Debt | Details on long-term debt at September 30, 2018, September 30, 2017 and December 31, 2017 are shown below:
($ millions) |  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2017 |
Unitil Corporation: |  |  |  |  |  |  |  |  |  |  |  |
6.33% Senior Notes, Due May 1, 2022 |  | $ | 20.0 |  |  | $ | 20.0 |  |  | $ | 20.0 |
3.70% Senior Notes, Due August 1, 2026 |  |  | 30.0 |  |  |  | 30.0 |  |  |  | 30.0 |
Unitil Energy First Mortgage Bonds: |  |  |  |  |  |  |  |  |  |  |  |
5.24% Senior Secured Notes, Due March 2, 2020 |  |  | 10.0 |  |  |  | 15.0 |  |  |  | 15.0 |
8.49% Senior Secured Notes, Due October 14, 2024 |  |  | 7.5 |  |  |  | 9.0 |  |  |  | 7.5 |
6.96% Senior Secured Notes, Due September 1, 2028 |  |  | 20.0 |  |  |  | 20.0 |  |  |  | 20.0 |
8.00% Senior Secured Notes, Due May 1, 2031 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
6.32% Senior Secured Notes, Due September 15, 2036 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
Fitchburg: |  |  |  |  |  |  |  |  |  |  |  |
6.75% Senior Notes, Due November 30, 2023 |  |  | 7.6 |  |  |  | 9.5 |  |  |  | 7.6 |
6.79% Senior Notes, Due October 15, 2025 |  |  | 10.0 |  |  |  | 10.0 |  |  |  | 10.0 |
3.52% Senior Notes, Due November 1, 2027 |  |  | 10.0 |  |  |  | — |  |  |  | 10.0 |
7.37% Notes, Due January 15, 2029 |  |  | 12.0 |  |  |  | 12.0 |  |  |  | 12.0 |
5.90% Notes, Due December 15, 2030 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
7.98% Notes, Due June 1, 2031 |  |  | 14.0 |  |  |  | 14.0 |  |  |  | 14.0 |
4.32% Senior Notes, Due November 1, 2047 |  |  | 15.0 |  |  |  | — |  |  |  | 15.0 |
Northern Utilities: |  |  |  |  |  |  |  |  |  |  |  |
6.95% Senior Notes, Due December 3, 2018 |  |  | 10.0 |  |  |  | 20.0 |  |  |  | 10.0 |
5.29% Senior Notes, Due March 2, 2020 |  |  | 16.6 |  |  |  | 25.0 |  |  |  | 25.0 |
3.52% Senior Notes, Due November 1, 2027 |  |  | 20.0 |  |  |  | — |  |  |  | 20.0 |
7.72% Senior Notes, Due December 3, 2038 |  |  | 50.0 |  |  |  | 50.0 |  |  |  | 50.0 |
4.42% Senior Notes, Due October 15, 2044 |  |  | 50.0 |  |  |  | 50.0 |  |  |  | 50.0 |
4.32% Senior Notes, Due November 1, 2047 |  |  | 30.0 |  |  |  | — |  |  |  | 30.0 |
Granite State Senior Notes: |  |  |  |  |  |  |  |  |  |  |  |
7.15% Senior Notes, Due December 15, 2018 |  |  | 3.3 |  |  |  | 6.7 |  |  |  | 3.3 |
3.72% Senior Notes, Due November 1, 2027 |  |  | 15.0 |  |  |  | — |  |  |  | 15.0 |
Total Long-Term Debt |  |  | 396.0 |  |  |  | 336.2 |  |  |  | 409.4 |
Less: Unamortized Debt Issuance Costs |  |  | 3.1 |  |  |  | 2.8 |  |  |  | 3.3 |
Total Long-Term Debt, net of Unamortized Debt Issuance Costs |  |  | 392.9 |  |  |  | 333.4 |  |  |  | 406.1 |
Less: Current Portion |  |  | 31.8 |  |  |  | 29.8 |  |  |  | 29.8 |
Total Long-term Debt, Less Current Portion |  | $ | 361.1 |  |  | $ | 303.6 |  |  | $ | 376.3 |
Fair Value of Long Term Debt |
($ millions) |  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2017 |
Estimated Fair Value of Long-Term Debt |  | $ | 418.7 |  |  | $ | 383.0 |  |  | $ | 457.1 |
Borrowing Limits Amounts Outstanding and Amounts Available under Credit Facility | The following table details the borrowing limits, amounts outstanding and amounts available under the Credit Facility as of September 30, 2018, September 30, 2017 and December 31, 2017:
|  | Credit Facility ($ millions) |
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2017 |
Limit |  | $ | 120.0 |  |  | $ | 120.0 |  |  | $ | 120.0 |
Short-Term Borrowings Outstanding |  |  | 69.1 |  |  |  | 111.9 |  |  |  | 38.3 |
Letters of Credit Outstanding |  |  | — |  |  |  | 1.1 |  |  |  | — |
Available |  | $ | 50.9 |  |  | $ | 7.0 |  |  | $ | 81.7 |

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