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Investments - Equity Securities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 143.2 | $ 200.5
Common stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | 22.8 | 15.0
Perpetual preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities | $ 120.4 | $ 185.5

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- Definition Amount of 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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