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Property and Casualty Insurance Reserves (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Beginning Property and Casualty Insurance Reserves: [Abstract] |  |  |  |  |  |
Gross of Reinsurance and Indemnification at Beginning of Year | $ 931.4 | $ 862.8 | $ 733.9 |  |  |
Less Reinsurance Recoverables and Indemnification at Beginning of Year | 106.4 |  |  |  |  |
Property and Casualty Insurance Reserves, Net of Reinsurance and Indemnification at Beginning of Year | 881.2 | 810.8 | 679.0 |  |  |
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance and Indemnification |  |  |  | $ 0.0 | $ 0.0 | $ 125.4
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | 18.9 | (20.7) | (20.1) |  |  |
Total Incurred Losses and LAE | 1,473.0 | 1,337.9 | 1,103.2 |  |  |
Paid Losses and LAE related to: |  |  |  |  |  |
Prior Years - Paid Losses and LAE | 522.4 | 436.5 | 373.6 |  |  |
Total Paid Losses and LAE | 1,390.5 | 1,267.5 | 1,096.8 |  |  |
Property and Casualty Insurance Reserves, Net of Reinsurance and Indemnification at End of Year | 881.2 | 810.8 | 679.0 | $ 963.7 | $ 881.2 | $ 810.8
Plus Reinsurance and Indemnification Recoverables at End of Year | 111.6 | 106.4 |  |  |  |
Property and Casualty Insurance Reserves, Gross of Reinsurance at End of Year | 1,016.8 | 931.4 | 862.8 |  |  |
Continuing Operations [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Current Year - Incurred Losses and LAE | 1,454.1 | 1,358.6 | 1,123.3 |  |  |
Prior Years - Incurred Losses and LAE | 20.4 | (14.4) | (11.5) |  |  |
Paid Losses and LAE related to: |  |  |  |  |  |
Current Year - Paid Losses and LAE | 868.1 | 831.0 | 723.2 |  |  |
Prior Years - Paid Losses and LAE | 518.5 | 431.9 | 366.2 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | (1.5) | (6.3) | (8.6) |  |  |
Paid Losses and LAE related to: |  |  |  |  |  |
Prior Years - Paid Losses and LAE | 3.9 | 4.6 | 7.4 |  |  |
Alliance United [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE |  |  | 7.7 |  |  |
Catastrophe [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | (4.5) | (19.3) | (7.8) |  |  |
Total Incurred Losses and LAE | 180.4 | 95.8 | 60.5 |  |  |
Property and Casualty Insurance [Member] |  |  |  |  |  |
Beginning Property and Casualty Insurance Reserves: [Abstract] |  |  |  |  |  |
Less Reinsurance Recoverables and Indemnification at Beginning of Year | 50.2 | 52.0 | 54.9 |  |  |
Paid Losses and LAE related to: |  |  |  |  |  |
Plus Reinsurance and Indemnification Recoverables at End of Year | 53.1 | 50.2 | 52.0 |  |  |
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | 19.5 | (16.8) | (13.3) |  |  |
Property and Casualty, Commercial Insurance Product Line [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | (0.6) | (3.9) | (6.8) |  |  |
Property and Casualty, Commercial Insurance Product Line [Member] | Continuing Operations [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | 0.9 | 2.4 | 1.8 |  |  |
Property and Casualty, Commercial Insurance Product Line [Member] | Discontinued Operations [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | (1.5) | (6.3) | (8.6) |  |  |
Personal Automobile [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | 22.2 | 11.3 | (1.8) |  |  |
Homeowners [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | 1.0 | (20.0) | (10.8) |  |  |
Homeowners [Member] | Catastrophe [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | (3.7) | (16.8) |  |  |  |
Other Personal Lines [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE | $ (3.7) | $ (8.1) | (0.7) |  |  |
Property and Casualty, Personal Insurance Product Line, Excluding Alliance United [Member] |  |  |  |  |  |
Incurred Losses and LAE related to: |  |  |  |  |  |
Prior Years - Incurred Losses and LAE |  |  | $ (21.0) |  |  |

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- Definition Acquired liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims and indemnification acquired. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column C)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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