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Business Segments - Segment Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | $ 1,135.2 | $ 1,052.9 | $ 3,326.6 | $ 2,320.8
Net Investment Income | 91.7 | 92.0 | 270.4 | 249.6
Other Income | 7.2 | 37.8 | 31.8 | 40.2
Total Revenues | 1,243.8 | 1,195.5 | 3,755.5 | 2,630.4
Income from Change in Fair Value of Equity and Convertible Securities | 9.8 | 11.0 | 99.7 | 12.1
Net Impairment Losses Recognized in Earnings | (1.8) | (1.8) | (12.1) | (2.3)
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Revenues | 1,233.0 | 1,146.8 | 3,604.6 | 2,573.1
Operating Segments | Preferred Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 191.0 | 184.0 | 565.1 | 541.9
Net Investment Income | 12.0 | 20.1 | 32.6 | 47.8
Total Revenues | 203.0 | 204.1 | 597.7 | 589.7
Operating Segments | Specialty Property & Casualty Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 783.4 | 711.2 | 2,278.7 | 1,309.6
Net Investment Income | 28.8 | 20.7 | 79.2 | 40.8
Other Income | 4.4 | 0.9 | 6.2 | 1.6
Total Revenues | 816.6 | 732.8 | 2,364.1 | 1,352.0
Operating Segments | Life & Health Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earned Premiums | 160.8 | 157.7 | 482.8 | 469.3
Net Investment Income | 49.7 | 51.0 | 154.4 | 159.2
Other Income | 2.9 | 1.2 | 5.6 | 2.9
Total Revenues | 213.4 | 209.9 | 642.8 | 631.4
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from Change in Fair Value of Equity and Convertible Securities | 9.8 | 11.0 | 99.7 | 12.1
Net Realized Gains on Sales of Investments | 1.7 | 3.6 | 39.1 | 10.0
Net Impairment Losses Recognized in Earnings | (1.8) | (1.8) | (12.1) | (2.3)
Other | $ 1.1 | $ 35.9 | $ 24.2 | $ 37.5

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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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=116637232&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=116637232&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=34713774&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=116637391&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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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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