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DEBT AND FINANCING ARRANGEMENTS (Tables) | 9 Months Ended
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Sep. 30, 2016
Details on Long Term Debt | Details on long-term debt at September 30, 2016, September 30, 2015 and December 31, 2015 are shown below:
($ millions) |  | September 30, |  |  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2015 |
Unitil Corporation Senior Notes: |  |  |  |  |  |  |  |  |  |  |  |
6.33% Notes, Due May 1, 2022 |  | $ | 20.0 |  |  | $ | 20.0 |  |  | $ | 20.0 |
3.70% Notes, Due August 1, 2026 |  |  | 30.0 |  |  |  | — |  |  |  | — |
Unitil Energy Systems, Inc.: |  |  |  |  |  |  |  |  |  |  |  |
First Mortgage Bonds: |  |  |  |  |  |  |  |  |  |  |  |
5.24% Series, Due March 2, 2020 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
8.49% Series, Due October 14, 2024 |  |  | 12.0 |  |  |  | 15.0 |  |  |  | 12.0 |
6.96% Series, Due September 1, 2028 |  |  | 20.0 |  |  |  | 20.0 |  |  |  | 20.0 |
8.00% Series, Due May 1, 2031 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
6.32% Series, Due September 15, 2036 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
Fitchburg Gas and Electric Light Company: |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Notes: |  |  |  |  |  |  |  |  |  |  |  |
6.75% Notes, Due November 30, 2023 |  |  | 11.4 |  |  |  | 15.2 |  |  |  | 11.4 |
7.37% Notes, Due January 15, 2029 |  |  | 12.0 |  |  |  | 12.0 |  |  |  | 12.0 |
7.98% Notes, Due June 1, 2031 |  |  | 14.0 |  |  |  | 14.0 |  |  |  | 14.0 |
6.79% Notes, Due October 15, 2025 |  |  | 10.0 |  |  |  | 10.0 |  |  |  | 10.0 |
5.90% Notes, Due December 15, 2030 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
Northern Utilities Senior Notes: |  |  |  |  |  |  |  |  |  |  |  |
6.95% Senior Notes, Series A, Due December 3, 2018 |  |  | 30.0 |  |  |  | 30.0 |  |  |  | 30.0 |
5.29% Senior Notes, Due March 2, 2020 |  |  | 25.0 |  |  |  | 25.0 |  |  |  | 25.0 |
7.72% Senior Notes, Series B, Due December 3, 2038 |  |  | 50.0 |  |  |  | 50.0 |  |  |  | 50.0 |
4.42% Senior Notes, Due October 15, 2044 |  |  | 50.0 |  |  |  | 50.0 |  |  |  | 50.0 |
Granite State Senior Notes: |  |  |  |  |  |  |  |  |  |  |  |
7.15% Senior Notes, Due December 15, 2018 |  |  | 10.0 |  |  |  | 10.0 |  |  |  | 10.0 |
Unitil Realty Corp.: |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes: |  |  |  |  |  |  |  |  |  |  |  |
8.00% Notes, Due Through August 1, 2017 |  |  | 0.6 |  |  |  | 1.3 |  |  |  | 1.1 |
Total Long-Term Debt |  |  | 355.0 |  |  |  | 332.5 |  |  |  | 325.5 |
Less: Unamortized Debt Issuance Costs |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 2.9 |
Total Long-Term Debt, net of Unamortized Debt Issuance Costs |  |  | 352.0 |  |  |  | 329.5 |  |  |  | 322.6 |
Less: Current Portion |  |  | 17.0 |  |  |  | 3.8 |  |  |  | 17.1 |
Total Long-term Debt, Less Current Portion |  | $ | 335.0 |  |  | $ | 325.7 |  |  | $ | 305.5 |
Fair Value of Long Term Debt |
($ millions) |  | September 30, |  |  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2015 |
Estimated Fair Value of Long-Term Debt |  | $ | 405.8 |  |  | $ | 356.7 |  |  | $ | 345.2 |
Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility | The following table details the borrowing limits, amounts outstanding and amounts available under the revolving Credit Facility as of September 30, 2016, September 30, 2015 and December 31, 2015:
|  | Revolving Credit Facility ($ millions) |
|  | September 30, |  |  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2015 |
Limit |  | $ | 120.0 |  |  | $ | 120.0 |  |  | $ | 120.0 |
Short-Term Borrowings Outstanding |  | $ | 36.9 |  |  | $ | 4.1 |  |  | $ | 42.0 |
Letters of Credit Outstanding |  | $ | 1.1 |  |  | $ | — |  |  | $ | — |
Available |  | $ | 82.0 |  |  | $ | 115.9 |  |  | $ | 78.0 |

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