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Quantitative Information Regarding Significant Unobservable Inputs (Details) $ in Millions | Jun. 30, 2022 USD ($) Rate | Dec. 31, 2021 USD ($) Rate
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fixed Maturity Securities |  | $ 36,576.4 | $ 43,336.0
Equity Securities |  | 37.0 | 33.7
Public Utilities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fixed Maturity Securities |  | 5,388.4 | 6,416.0
Corporate Debt Securities |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fixed Maturity Securities |  | 25,287.9 | 29,823.4
Fair Value, Inputs, Level 3 | Discounted Cash Flow | Embedded Derivative in Modified Coinsurance Arrangement |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Embedded Derivative in Modified Coinsurance Arrangement |  | $ (34.3) | $ (30.1)
Fair Value, Inputs, Level 3 | Discounted Cash Flow | Embedded Derivative in Modified Coinsurance Arrangement | Weighted Average | Spread of Swap Curve |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Embedded Derivative Liability, Measurement Input | Rate |  | 0.010 | 0.007
Fair Value, Inputs, Level 3 | Public Utilities | Discounted Cash Flow |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fixed Maturity Securities |  | $ 13.6 |
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private |  | $ 11.1 | $ 111.8
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach | Minimum | Lack of Marketability |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private, Measurement Input | Rate | [1] |  | 0.0014
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach | Minimum | Volatility of Credit |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private, Measurement Input | Rate | [2] | 0.0486 | 0.0630
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach | Maximum | Lack of Marketability |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private, Measurement Input | Rate | [1] |  | 0.0073
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach | Maximum | Volatility of Credit |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private, Measurement Input | Rate | [2] | 0.0486 | 0.0630
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach | Weighted Average | Lack of Marketability |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private, Measurement Input | Rate | [1] |  | 0.0051
Fair Value, Inputs, Level 3 | Corporate Debt Securities | Market Approach | Weighted Average | Volatility of Credit |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
All Other Corporate Bonds - Private, Measurement Input | Rate | [2] | 0.0486 | 0.0630
Fair Value, Inputs, Level 3 | Equity Securities | Market Approach |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Equity Securities |  | $ 10.9 | $ 5.8
[1] | Represents basis point adjustments to apply a discount due to the illiquidity of an investment
[2] | Represents basis point adjustments for credit-specific factors

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