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Investment Securities - Investment Holdings Fixed Maturity Table (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
U.S. Government and agency obligations |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost or Amortized Cost | $ 206.2 | $ 231.7
Gross Unrealized Gains | 4.4 | 1.0
Gross Unrealized Losses | 0.0 | (0.2)
Carrying Value | 210.6 | 232.5
Debt securities issued by corporations |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost or Amortized Cost | 505.4 | 454.9
Gross Unrealized Gains | 24.0 | 12.5
Gross Unrealized Losses | (0.7) | (0.2)
Carrying Value | 528.7 | 467.2
Municipal obligations |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost or Amortized Cost | 251.0 | 284.7
Gross Unrealized Gains | 20.4 | 12.5
Gross Unrealized Losses | (0.1) | (0.1)
Carrying Value | 271.3 | 297.1
Mortgage and asset-backed securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost or Amortized Cost | 203.6 | 206.6
Gross Unrealized Gains | 7.3 | 2.7
Gross Unrealized Losses | 0.0 | (0.3)
Carrying Value | 210.9 | 209.0
Total fixed maturity investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost or Amortized Cost | 1,166.2 | 1,177.9
Gross Unrealized Gains | 56.1 | 28.7
Gross Unrealized Losses | (0.8) | (0.8)
Carrying Value | $ 1,221.5 | $ 1,205.8

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