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Fair Value Measurements - Quantitative Information for Level 3 Measurements (Details) - Recurring Fair Value Measurements
$ in Millions
Jun. 30, 2024
USD ($)
item
Dec. 31, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
item
Unobservable inputs      
Assets measured at fair value | $ $ 203,863.0 $ 198,585.1 $ 183,823.0
Liabilities measured at fair value | $ 2,118.9 1,625.3 2,812.9
Fair value hierarchy Level 3      
Unobservable inputs      
Assets measured at fair value | $ 5,195.8 5,091.8 3,415.8
Liabilities measured at fair value | $ 2,573.4 2,097.9 3,421.0
Fair value hierarchy Level 3 | Investment and universal life contracts      
Unobservable inputs      
Liabilities measured at fair value | $ $ (230.0) $ (115.5) $ (46.3)
Embedded derivative, Valuation technique Discounted cash flow Discounted cash flow Discounted cash flow
Fair value hierarchy Level 3 | Investment and universal life contracts | Long duration interest rate | Minimum      
Unobservable inputs      
Embedded derivative, Input 0.028 0.025  
Fair value hierarchy Level 3 | Investment and universal life contracts | Long duration interest rate | Maximum      
Unobservable inputs      
Embedded derivative, Input 0.051 0.048  
Fair value hierarchy Level 3 | Investment and universal life contracts | Long duration interest rate | Weighted average input      
Unobservable inputs      
Embedded derivative, Input 0.044 0.040  
Fair value hierarchy Level 3 | Investment and universal life contracts | Long-term equity market volatility | Minimum      
Unobservable inputs      
Embedded derivative, Input 0.147 0.155  
Fair value hierarchy Level 3 | Investment and universal life contracts | Long-term equity market volatility | Maximum      
Unobservable inputs      
Embedded derivative, Input 0.416 0.401  
Fair value hierarchy Level 3 | Investment and universal life contracts | Long-term equity market volatility | Weighted average input      
Unobservable inputs      
Embedded derivative, Input 0.205 0.192  
Fair value hierarchy Level 3 | Investment and universal life contracts | Non-performance risk | Minimum      
Unobservable inputs      
Embedded derivative, Input 0.006 0.008  
Fair value hierarchy Level 3 | Investment and universal life contracts | Non-performance risk | Maximum      
Unobservable inputs      
Embedded derivative, Input 0.013 0.016  
Fair value hierarchy Level 3 | Investment and universal life contracts | Non-performance risk | Weighted average input      
Unobservable inputs      
Embedded derivative, Input 0.010 0.011  
Fair value hierarchy Level 3 | Investment and universal life contracts | Lapse rate | Minimum      
Unobservable inputs      
Embedded derivative, Input 0.000 0.000  
Fair value hierarchy Level 3 | Investment and universal life contracts | Lapse rate | Maximum      
Unobservable inputs      
Embedded derivative, Input 0.550 0.550  
Fair value hierarchy Level 3 | Investment and universal life contracts | Lapse rate | Weighted average input      
Unobservable inputs      
Embedded derivative, Input 0.100 0.070  
Fair value hierarchy Level 3 | Fixed maturities | Trading      
Unobservable inputs      
Assets measured at fair value | $ $ 117.9 $ 168.7 $ 92.5
Fixed maturities, trading, Valuation technique Discounted cash flow Discounted cash flow Discounted cash flow
Fair value hierarchy Level 3 | Fixed maturities | Trading | Discount rate | Minimum      
Unobservable inputs      
Fixed maturities, trading, Input 0.101 0.114  
Fair value hierarchy Level 3 | Fixed maturities | Trading | Discount rate | Maximum      
Unobservable inputs      
Fixed maturities, trading, Input 0.164 0.223  
Fair value hierarchy Level 3 | Fixed maturities | Trading | Discount rate | Weighted average input      
Unobservable inputs      
Fixed maturities, trading, Input 0.130 0.134  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale      
Unobservable inputs      
Assets measured at fair value | $ $ 1,964.4 $ 1,997.4 $ 1,479.9
Debt Securities, Available-for-sale, Valuation Technique [Extensible List] Discounted cash flow Discounted cash flow Discounted cash flow
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Discount rate | Minimum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.054 0.049  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Discount rate | Maximum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.266 0.242  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Discount rate | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.110 0.120  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Earnings before interest, taxes, depreciation and amortization multiple      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0366 0.0325  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Earnings before interest, taxes, depreciation and amortization multiple | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0366 0.0325  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Illiquidity premium | Minimum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0 0.0030  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Illiquidity premium | Maximum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0791 0.0483  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Illiquidity premium | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0137 0.0121  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Comparability adjustment | Minimum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0 0.0067  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Comparability adjustment | Maximum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0800 0.0217  
Fair value hierarchy Level 3 | Corporate debt securities | Available-for-sale | Comparability adjustment | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0150 0.0141  
Fair value hierarchy Level 3 | Collateralized debt obligations | Available-for-sale      
Unobservable inputs      
Assets measured at fair value | $ $ 104.7 $ 74.6 $ 39.5
Debt Securities, Available-for-sale, Valuation Technique [Extensible List] Discounted cash flow Discounted cash flow Discounted cash flow
Fair value hierarchy Level 3 | Collateralized debt obligations | Available-for-sale | Discount rate      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.055 0.041  
Fair value hierarchy Level 3 | Collateralized debt obligations | Available-for-sale | Discount rate | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.055 0.041  
Fair value hierarchy Level 3 | Collateralized debt obligations | Available-for-sale | Comparability adjustment      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0012 0.0020  
Fair value hierarchy Level 3 | Collateralized debt obligations | Available-for-sale | Comparability adjustment | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0012 0.0020  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale      
Unobservable inputs      
Assets measured at fair value | $ $ 1,156.8 $ 879.5 $ 467.8
Debt Securities, Available-for-sale, Valuation Technique [Extensible List] Discounted cash flow Discounted cash flow Discounted cash flow
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Discount rate | Minimum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.053 0.050  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Discount rate | Maximum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.145 0.106  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Discount rate | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.083 0.074  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Illiquidity premium | Minimum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0 0.0069  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Illiquidity premium | Maximum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0275 0.0650  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Illiquidity premium | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0271 0.0337  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Comparability adjustment | Minimum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input (0.0022) (0.0020)  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Comparability adjustment | Maximum      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0454 0.0213  
Fair value hierarchy Level 3 | Other debt obligations | Available-for-sale | Comparability adjustment | Weighted average input      
Unobservable inputs      
Fixed maturities, available-for-sale, Input 0.0155 0.0092  
Fair value hierarchy Level 3 | Other investments      
Unobservable inputs      
Assets measured at fair value | $ $ 171.6 $ 163.2  
Fair value hierarchy Level 3 | Other investments | Discount rate | Minimum      
Unobservable inputs      
Other investments, Input 0.120 0.120  
Fair value hierarchy Level 3 | Other investments | Discount rate | Maximum      
Unobservable inputs      
Other investments, Input 0.135 0.135  
Fair value hierarchy Level 3 | Other investments | Discount rate | Weighted average input      
Unobservable inputs      
Other investments, Input 0.124 0.126  
Fair value hierarchy Level 3 | Other investments | Probability of default | Minimum      
Unobservable inputs      
Other investments, Input 0.060 0.060  
Fair value hierarchy Level 3 | Other investments | Probability of default | Maximum      
Unobservable inputs      
Other investments, Input 0.100 0.100  
Fair value hierarchy Level 3 | Other investments | Probability of default | Weighted average input      
Unobservable inputs      
Other investments, Input 0.083 0.085  
Fair value hierarchy Level 3 | Other investments | Potential loss severity | Minimum      
Unobservable inputs      
Other investments, Input 0.870 0.870  
Fair value hierarchy Level 3 | Other investments | Potential loss severity | Maximum      
Unobservable inputs      
Other investments, Input 1.000 1.000  
Fair value hierarchy Level 3 | Other investments | Potential loss severity | Weighted average input      
Unobservable inputs      
Other investments, Input 0.914 0.907  
Fair value hierarchy Level 3 | Separate account assets      
Unobservable inputs      
Assets measured at fair value | $ $ 718.4 $ 752.8 $ 1,034.1
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Discount rate | Minimum      
Unobservable inputs      
Separate account assets, Input 0.065 0.065 0.055
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Discount rate | Maximum      
Unobservable inputs      
Separate account assets, Input 0.100 0.100 0.100
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Discount rate | Weighted average input      
Unobservable inputs      
Separate account assets, Input 0.071 0.075 0.070
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Terminal capitalization rate | Minimum      
Unobservable inputs      
Separate account assets, Input 0.052 0.053 0.045
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Terminal capitalization rate | Maximum      
Unobservable inputs      
Separate account assets, Input 0.095 0.095 0.095
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Terminal capitalization rate | Weighted average input      
Unobservable inputs      
Separate account assets, Input 0.058 0.061 0.058
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Average market rent growth rate | Minimum      
Unobservable inputs      
Separate account assets, Input 0.018 0.020 0.020
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Average market rent growth rate | Maximum      
Unobservable inputs      
Separate account assets, Input 0.045 0.037 0.038
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Average market rent growth rate | Weighted average input      
Unobservable inputs      
Separate account assets, Input 0.027 0.029 0.030
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Loan to value | Minimum      
Unobservable inputs      
Separate account assets, Input 0.456 0.460 0.436
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Loan to value | Maximum      
Unobservable inputs      
Separate account assets, Input 0.714 0.720 0.622
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Loan to value | Weighted average input      
Unobservable inputs      
Separate account assets, Input 0.585 0.553 0.506
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Market interest rate | Minimum      
Unobservable inputs      
Separate account assets, Input 0.053 0.053 0.053
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Market interest rate | Maximum      
Unobservable inputs      
Separate account assets, Input 0.074 0.081 0.086
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Market interest rate | Weighted average input      
Unobservable inputs      
Separate account assets, Input 0.062 0.064 0.066