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Basis of Presentation, Significant Accounting Polices and Practicies and Recent Accounting Pronouncements Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares $ / MMBTU | Jun. 30, 2015 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($)
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Earnings Per Share, Diluted | $ / shares | $ (0.66) | $ (0.12) | $ (0.38) | $ (0.30) | $ (0.95) | $ (2.09) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | $ / shares | (1.04) |  | 0.44 |  | (1.34) | 0.55 |  |
Income (Loss) from Continuing Operations, Per Diluted Share | $ / shares | 0.38 | (0.01) | (0.82) | 0.04 | 0.39 | (2.64) |  |
Earnings Per Share, Basic | $ / shares | (0.67) | (0.12) | (0.38) | (0.30) | (0.97) | (2.09) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ / shares | (1.06) |  | 0.44 |  | (1.37) | 0.55 |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ / shares | $ 0.39 | $ (0.01) | $ (0.82) | $ 0.04 | $ 0.40 | $ (2.64) |  |
Net Income (Loss) Attributable to Parent | $ (132.9) | $ (24.7) | $ (75.6) | $ (58.6) | $ (191.5) | $ (413.7) |  |
Less: Net income attributable to noncontrolling interest | 39.9 | 40.6 | 34.2 | 81.5 | 121.4 | 28.4 |  |
Net loss | (93.0) | 15.9 | (41.4) | 22.9 | (70.1) | (385.3) |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (208.4) |  | 102.9 |  | (257.1) | 125.7 |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 115.4 | 29.0 | (144.3) | 71.6 | 187.0 | (511.0) |  |
Income tax benefit | (8.4) | $ (8.5) | (37.8) | $ (6.6) | $ (15.0) | (32.6) |  |
Document Period End Date |  |  |  |  | Jun. 30, 2016 |  |  |
Deferred Finance Costs, Net | 91.6 |  |  |  | $ 91.6 |  |  | $ 102.9
Asset Impairment Charges | 15.7 |  | 112.6 |  | 106.5 | 577.0 |  |
Impairment of Proved Oil and Gas Properties |  |  |  |  | 93.2 | 439.4 |  |
Energy Segment [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  | (19.7) | (321.1) |  |
Less: Net income attributable to noncontrolling interest |  |  |  |  |  | (0.8) |  |
Net loss |  |  |  |  | (19.7) | (321.9) |  |
Asset Impairment Charges | $ 17.6 |  | $ 102.8 |  | $ 93.2 | $ 439.4 |  |
FGL [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 19.60% |  |  |  | 19.60% |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity | $ 26.2 |  |  |  | $ 26.2 |  |  |
Raven Re [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 207.5 |  |  |  | 207.5 |  |  | 226.3
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus | 3.2 |  |  |  | 3.2 |  |  | 2.5
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus | 0.1 |  |  |  | 0.1 |  |  | 33.1
Statutory Accounting Practices, Statutory Capital and Surplus, Change in Permitted Practice to Non-Permitted, Balance | 210.6 |  |  |  | $ 210.6 |  |  | 195.6
Natural Gas [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Average Sales Prices | $ / MMBTU |  |  |  |  | 2.24 |  |  |
Accounting Standards Update 2015-17 [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Assets, Net | $ 39.1 |  |  |  | $ 39.1 |  |  |
Accounting Standards Update 2016-09 [Domain] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits that Would Result in Deferred Tax Assets |  |  |  |  |  |  | $ (4.3) | $ (28.4)
Goodwill [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | $ 3.4 |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Earnings Per Share, Diluted | $ / shares |  | $ 0.05 |  | $ 0.05 |  |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share | $ / shares |  | 0.09 |  | 0.09 |  |  |  |
Earnings Per Share, Basic | $ / shares |  | 0.05 |  | 0.05 |  |  |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ / shares |  | $ 0.09 |  | $ 0.09 |  |  |  |
Net Income (Loss) Attributable to Parent |  | $ 10.1 |  | $ 10.1 |  |  |  |
Less: Net income attributable to noncontrolling interest |  | 7.3 |  | 7.3 |  |  |  |
Net loss |  | 17.4 |  | 17.4 |  |  |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  | 17.4 |  | 17.4 |  |  |  |
Income tax benefit |  | $ (17.4) |  | $ (17.4) |  |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |
Earnings Per Share, Diluted | $ / shares |  | $ (0.18) |  | $ (0.35) |  |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share | $ / shares |  | (0.10) |  | (0.05) |  |  |  |
Earnings Per Share, Basic | $ / shares |  | (0.18) |  | (0.35) |  |  |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ / shares |  | $ (0.10) |  | $ (0.05) |  |  |  |
Net Income (Loss) Attributable to Parent |  | $ (34.8) |  | $ (68.7) |  |  |  |
Less: Net income attributable to noncontrolling interest |  | 33.3 |  | 74.2 |  |  |  |
Net loss |  | (1.5) |  | 5.5 |  |  |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  | 11.6 |  | 54.2 |  |  |  |
Income tax benefit |  | $ 8.9 |  | $ 10.8 |  |  |  |

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