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Business Segments - Segment Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums | $ 561.4 | $ 558.9 | $ 553.7 | $ 546.0 | $ 541.5 | $ 536.7 | $ 500.1 | $ 431.3 | $ 2,220.0 | $ 2,009.6 | $ 1,862.2
Net Investment Income | 79.9 | 77.7 | 73.7 | 67.0 | 79.4 | 75.9 | 76.7 | 70.6 | 298.3 | 302.6 | 309.1
Other Income | 1.0 | 0.8 | 0.6 | 0.8 | 1.4 | 0.8 | 0.6 | 0.9 | 3.2 | 3.7 | 1.4
Total Revenues | 642.7 | 640.7 | 627.2 | 611.3 | 617.0 | 615.4 | 609.2 | 499.2 | 2,521.9 | 2,340.8 | 2,196.6
Net Realized Gains on Sales of Investments | 9.1 | 11.6 | 5.6 | 6.8 | 9.4 | 5.3 | 34.0 | 3.4 | 33.1 | 52.1 | 39.1
Net Impairment Losses Recognized in Earnings | $ (8.7) | $ (8.3) | $ (6.4) | $ (9.3) | $ (14.7) | $ (3.3) | $ (2.2) | $ (7.0) | (32.7) | (27.2) | (15.2)
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 2,508.9 | 2,300.1 | 2,155.0
Operating Segments [Member] | Property and Casualty Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 1,614.8 | 1,415.2 | 1,249.5
Net Investment Income |  |  |  |  |  |  |  |  | 72.4 | 73.3 | 72.7
Other Income |  |  |  |  |  |  |  |  | 0.5 | 0.6 | 0.5
Total Revenues |  |  |  |  |  |  |  |  | 1,687.7 | 1,489.1 | 1,322.7
Operating Segments [Member] | Life and Health Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earned Premiums |  |  |  |  |  |  |  |  | 605.2 | 594.4 | 612.7
Net Investment Income |  |  |  |  |  |  |  |  | 213.2 | 214.2 | 218.7
Other Income |  |  |  |  |  |  |  |  | 2.8 | 2.4 | 0.9
Total Revenues |  |  |  |  |  |  |  |  | 821.2 | 811.0 | 832.3
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  | 12.6 | 15.8 | 17.7
Net Realized Gains on Sales of Investments |  |  |  |  |  |  |  |  | 33.1 | 52.1 | 39.1
Net Impairment Losses Recognized in Earnings |  |  |  |  |  |  |  |  | $ (32.7) | $ (27.2) | $ (15.2)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20187-122688 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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