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INCOME TAXES - Significant Items in Net Deferred Tax Liability (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Deferred tax assets: |  |  |  |
Reserves not currently deductible | $ 16.0 |  | $ 13.9 |
Pension and other postretirement benefits | 67.3 |  | 71.4 |
Unamortized investment tax credits | 1.6 |  | 1.8 |
Other | 36.9 | [1] | 12.5 | [1]
Total deferred tax assets | 121.8 |  | 99.6 |
Deferred tax liabilities: |  |  |  |
Relating to property | 366.9 |  | 342.0 |
Regulatory pension and other postretirement benefits | 108.5 |  | 124.8 |
Deferred gas costs | 20.4 |  | 7.1 |
Other | 19.7 |  | 5.8 |
Total deferred tax liabilities | 515.5 |  | 479.7 |
Total deferred tax liabilities | 393.7 |  | 380.1 |
Net deferred tax liability - current | (9.9) | [1] | (1.0) | [1]
Net deferred tax liability - non-current | 383.8 | [1] | 379.1 | [1]
Laclede Gas |  |  |  |
Deferred tax assets: |  |  |  |
Reserves not currently deductible | 16.0 |  | 13.9 |
Pension and other postretirement benefits | 67.3 |  | 71.4 |
Unamortized investment tax credits | 1.6 |  | 1.8 |
Other | 20.7 | [1] | 10.5 | [1]
Total deferred tax assets | 105.6 |  | 97.6 |
Deferred tax liabilities: |  |  |  |
Relating to property | 361.2 |  | 342.0 |
Regulatory pension and other postretirement benefits | 119.2 |  | 124.9 |
Deferred gas costs | 20.4 |  | 7.1 |
Other | 15.9 |  | 5.4 |
Total deferred tax liabilities | 516.7 |  | 479.4 |
Total deferred tax liabilities | 411.1 |  | 381.8 |
Net deferred tax liability - current | (11.3) | [1] | (1.7) | [1]
Net deferred tax liability - non-current | 399.8 | [1] | 380.1 | [1]
State |  |  |  |
Deferred tax liabilities: |  |  |  |
Tax credits included in net deferred tax liability | 8.7 |  |  |
Tax credits classified as current | 6.9 |  |  |
Tax credits classified as noncurrent | 1.8 |  |  |
State | Laclede Gas |  |  |  |
Deferred tax liabilities: |  |  |  |
Tax credits included in net deferred tax liability | 8.0 |  |  |
Tax credits classified as current | 6.2 |  |  |
Tax credits classified as noncurrent | $ 1.8 |  |  |
[1] | The Company periodically invests in tax credits. As of September 30, 2014, $8.7 of state tax credits are included in Other and Net deferred tax liability. $6.9 of state tax credits were classified as current. $1.8 of state tax credits were classified as non-current.

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