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Business Segments - Segment Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Earned Premiums | $ 1,337.7 |  | $ 1,085.3 | $ 2,538.5 | $ 2,251.7
Net Investment Income | 113.9 |  | 67.8 | 217.0 | 153.4
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | (7.7) |  |  | (23.1) | 0.0
Other Income (Loss) | 7.0 |  | 1.5 | 8.5 | 91.8
Total Revenues | 1,507.7 |  | 1,230.9 | 2,859.7 | 2,459.9
Income (Loss) from Change in Fair Value of Equity and Convertible Securities | 40.8 |  | 71.6 | 93.0 | (46.2)
Impairment Losses |  |  |  | (7.2) | (19.0)
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Revenues | 1,445.7 |  | 1,151.5 | 2,734.1 | 2,408.4
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earned Premiums | 1,010.3 |  | 759.0 | 1,887.9 | 1,581.5
Net Investment Income | 42.7 |  | 16.9 | 77.7 | 45.7
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | (3.7) |  |  | (11.0) |
Other Income (Loss) | 1.0 |  | 0.1 | 1.9 | 1.0
Total Revenues | 1,050.3 |  | 776.0 | 1,956.5 | 1,628.2
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earned Premiums | 163.2 |  | 163.6 | 325.4 | 344.5
Net Investment Income | 19.5 |  | 4.3 | 35.4 | 14.0
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | (2.0) |  |  | (6.1) |
Other Income (Loss) | 0.0 | $ 0.1 | 0.1 | 0.0 |
Total Revenues | 180.7 |  | 168.0 | 354.7 | 358.6
Operating Segments | Life & Health Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earned Premiums | 164.2 |  | 162.7 | 325.2 | 325.7
Net Investment Income | 52.4 |  | 44.3 | 103.5 | 95.3
Variable Interest Entity, Measure of Activity, Income or Loss before Tax | (2.0) |  |  | (6.0) |
Other Income (Loss) | 0.1 |  | 0.5 | 0.2 | 0.6
Total Revenues | 214.7 |  | 207.5 | 422.9 | 421.6
Segment Reconciling Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Income (Loss) from Change in Fair Value of Equity and Convertible Securities | 40.8 |  | 71.6 | 93.0 | (46.2)
Net Realized Gains on Sales of Investments | 19.2 |  | 11.7 | 33.0 | 28.2
Impairment Losses | (3.2) |  | (7.0) | (7.2) | (19.0)
Other | $ 5.2 |  | $ 3.1 | $ 6.8 | $ 88.5

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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