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v3.22.2.2

Fair Value Measurements - Quantitative Information for Level 3 Inputs (Details) $ in Millions | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | $ 322.7 | $ 830.6
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total | 7,044.4 | 8,863.9
Total Liabilities | 0.3 |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | 0.3 |
Fair Value, Measurements, Recurring | Other Industries | Preferred Stocks |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 11.7 | 17.6
Fair Value, Measurements, Recurring | Other Industries | Common Stock |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 1.1 | 2.9
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total | 233.2 | 251.4
Total Liabilities | 0.0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | 0.0 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other Industries | Preferred Stocks |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 2.0 | 1.5
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other Industries | Common Stock |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 0.5 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total | 183.8 | 586.6
Total Liabilities | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Other Industries | Preferred Stocks |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Other Industries | Common Stock |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 0.2 | 2.9
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total | 6,418.9 | 7,700.9
Total Liabilities | 0.3 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | 0.3 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Other Industries | Preferred Stocks |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 9.7 | 16.1
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Other Industries | Common Stock |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 0.4 | 0.0
Measured at Net Asset Value | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total | 208.5 | 325.0
Total Liabilities | 0.0 |
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Designated as Hedging Instrument |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Derivative Liability | 0.0 |
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Other Industries | Preferred Stocks |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | 0.0 | 0.0
Measured at Net Asset Value | Fair Value, Measurements, Recurring | Other Industries | Common Stock |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Equity Securities, FV-NI, Current | $ 0.0 | $ 0.0
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Market Yield | Minimum | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.062 | 0.051
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Market Yield | Maximum | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.345 | 0.202
Senior Debt | Measurement Input, Discount Rate | Non-investment-grade | Market Yield | Weighted-average Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.103 | 0.085
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Market Yield | Minimum | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.091 | 0.060
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Market Yield | Maximum | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.279 | 0.275
Junior Debt | Measurement Input, Discount Rate | Non-investment-grade | Market Yield | Weighted-average Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Debt instrument, measurement input | 0.177 | 0.150
Private Placement | Investment-grade | Market Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 63.4 | $ 87.9
Private Placement | Measurement Input, Discount Rate | Investment-grade | Market Yield | Minimum | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.046 | 0.023
Private Placement | Measurement Input, Discount Rate | Investment-grade | Market Yield | Maximum | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.129 | 0.103
Private Placement | Measurement Input, Discount Rate | Investment-grade | Market Yield | Weighted-average Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Alternative investment, measurement input | 0.086 | 0.054
Senior Debt | Non-investment-grade | Market Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 67.6 | $ 76.1
Junior Debt | Non-investment-grade | Market Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 48.0 | 53.9
Other | Market Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | 51.7 | 32.0
Investments in Fixed Maturities | Market Yield | Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total Fair Value | $ 230.7 | $ 249.9

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