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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Net Investment Income |  |  |  |
Total net investment income | $ 105.2 | $ 109.2 | $ 203.1 | $ 204.7
Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Investment expenses | (2.5) | (2.5) | (5.1) | (4.6)
Total net investment income | 79.4 | 84.1 | 152.4 | 155.2
Deposit asset on reinsurance |  |  |  |
Net Investment Income |  |  |  |
Total net investment income | 25.8 | 25.1 | 50.7 | 49.5
Fixed maturity securities | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 62.0 | 59.4 | 120.6 | 117.4
Equity securities | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 4.0 | 1.3 | 5.3 | 2.4
Limited partnership interests | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 13.2 | 23.0 | 26.2 | 34.3
Short-term and other investments | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | $ 2.7 | $ 2.9 | $ 5.4 | $ 5.7

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- Definition Amount, before 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + 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 https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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