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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred Policy Acquisition Costs | $ 294.3 |  |  |  | $ 358.4 |  |  |  | $ 361.1 |  |  |  | $ 294.3 | $ 358.4 | $ 361.1 |
Net Reserves for Losses and LAE | 5,234.3 |  |  |  | 4,759.2 |  |  |  | 4,583.4 |  |  |  | 5,234.3 | 4,759.2 | 4,583.4 | $ 4,400.8
Net Reserves for Unearned Premiums | 1,335.3 |  |  |  | 1,363.4 |  |  |  | 1,418.3 |  |  |  | 1,335.3 | 1,363.4 | 1,418.3 |
Net earned premium | 511.0 | $ 652.5 | $ 562.0 | $ 581.1 | 612.4 | $ 681.0 | $ 680.8 | $ 663.1 | 629.7 | $ 640.6 | $ 609.4 | $ 593.6 | 2,306.6 | 2,637.3 | 2,473.3 |
Net Investment Income |  |  |  |  |  |  |  |  |  |  |  |  | 189.0 | 187.1 | 185.5 |
Losses and LAE Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,994.7 | 1,576.1 | 1,366.2 |
Policy Acquisition Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 400.5 | 528.9 | 483.6 |
Net written premiums |  |  |  |  |  |  |  |  |  |  |  |  | 2,212.5 | 2,593.7 | 2,646.2 |
General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 411.2 | 406.6 | 360.1 |
Reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs | 263.0 |  |  |  | 239.6 |  |  |  | 235.2 |  |  |  | 263.0 | 239.6 | 235.2 |
Net Reserves for Losses and LAE | 2,917.1 |  |  |  | 2,462.1 |  |  |  | 2,409.5 |  |  |  | 2,917.1 | 2,462.1 | 2,409.5 |
Net Reserves for Unearned Premiums | 1,067.3 |  |  |  | 813.3 |  |  |  | 484.2 |  |  |  | 1,067.3 | 813.3 | 484.2 |
Net earned premium |  |  |  |  |  |  |  |  |  |  |  |  | 1,206.1 | 1,181.9 | 1,072.6 |
Losses and LAE Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,116.4 | 657.9 | 491.6 |
Policy Acquisition Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 235.5 | 226.4 | 224.7 |
Net written premiums |  |  |  |  |  |  |  |  |  |  |  |  | 1,250.0 | 1,269.2 | 1,153.5 |
General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 157.3 | 178.2 | 146.5 |
Insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Costs | 31.3 |  |  |  | 118.8 |  |  |  | 125.9 |  |  |  | 31.3 | 118.8 | 125.9 |
Net Reserves for Losses and LAE | 2,317.2 |  |  |  | 2,297.1 |  |  |  | 2,173.9 |  |  |  | 2,317.2 | 2,297.1 | 2,173.9 |
Net Reserves for Unearned Premiums | $ 268.0 |  |  |  | $ 550.1 |  |  |  | $ 934.1 |  |  |  | 268.0 | 550.1 | 934.1 |
Net earned premium |  |  |  |  |  |  |  |  |  |  |  |  | 1,100.5 | 1,455.4 | 1,400.7 |
Losses and LAE Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 878.3 | 918.2 | 874.6 |
Policy Acquisition Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 165.0 | 302.5 | 258.9 |
Net written premiums |  |  |  |  |  |  |  |  |  |  |  |  | 962.5 | 1,324.5 | 1,492.7 |
General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 253.9 | $ 228.4 | $ 213.6 |

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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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