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Income from Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Investment Income [Line Items] |  |  |
Investment income | $ 461.6 | $ 382.6 | $ 383.4
Investment expenses | 34.3 | 34.4 | 19.1
Net investment income | 427.3 | 348.2 | 364.3
Proceeds from Sale of Equity Method Investments |  | 0.4 |
Realized Investment Gains | 68.0 | 48.3 | 46.9
Realized Investment Losses | (3.2) | (10.2) | (5.0)
Equity Method Investment, Realized Gain (Loss) on Disposal | (0.4) |  |
Interest on Fixed Income Securities |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 277.7 | 289.8 | 299.4
Dividends on Equity Securities Excluding Alternative Investments |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 15.9 | 15.4 | 22.9
Total Alternative Investments |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 103.6 | 27.0 | 19.0
Equity Method Limited Liability Investments |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 56.7 | 4.9 | 1.0
Limited Liability Investments Included in Equity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 46.9 | 22.1 | 18.0
Short-term Investments |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 1.0 | 5.5 | 8.2
Loans to Policyholders |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 21.7 | 22.1 | 22.6
Real Estate |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 9.3 | 9.6 | 9.8
Investment expenses | 9.7 | 8.8 | 9.6
Realized Investment Gains | 0.1 | 1.8 | 0.0
Realized Investment Losses | (0.4) |  |
Other |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 32.4 | 13.2 | 1.5
Investment expenses | $ 24.6 | $ 25.6 | $ 9.5

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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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