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Income From Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | $ 56.9 | $ 38.0 | $ 55.3
Realized Investment Losses |  |  |  |  |  |  |  |  | (1.0) | (5.1) | (2.9)
Net Gains (Losses) on Trading Securities |  |  |  |  |  |  |  |  | 0.6 | 0.2 | (0.3)
Net Realized Gains (Losses) on Sales of Investments | $ 11.5 | $ 8.1 | $ 26.4 | $ 10.5 | $ 9.1 | $ 11.6 | $ 5.6 | $ 6.8 | 56.5 | 33.1 | 52.1
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 8.4 | 17.0 | 16.1
Losses on Sales |  |  |  |  |  |  |  |  | (0.9) | (4.6) | (1.1)
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on Sales |  |  |  |  |  |  |  |  | 42.0 | 19.9 | 39.2
Losses on Sales |  |  |  |  |  |  |  |  | 0.0 | (0.3) | (1.6)
Real Estate Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 6.4 | 1.1 | 0.0
Realized Investment Losses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.2)
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized Investment Gains |  |  |  |  |  |  |  |  | 0.1 | 0.0 | 0.0
Realized Investment Losses |  |  |  |  |  |  |  |  | $ (0.1) | $ (0.2) | $ 0.0

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- Definition The net realized gains on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity + References No definition available. + Details
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- Definition The net realized losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity + References No definition available. + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition Amount of loss realized on the sale of debt or equity securities classified as available-for-sale. Excludes other than temporary impairments (OTTI). + References No definition available. + 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://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 of gain (loss) realized from securities classified as trading. + 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 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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