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Fair Value Measurements Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Accumulated other comprehensive (loss)    
Commercial mortgage loans      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year $ 312.1    
Balance at the end of the year 295.0   $ 312.1
Middle market loans      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 106.9    
Balance at the end of the year 102.1   106.9
Equity securities      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 6.6    
Balance at the end of the year 12.1   6.6
Short-term investments      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 25.6    
Balance at the end of the year     25.6
Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) (13.7) $ (4.6)  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 482.4 533.0  
Recurring | Level 3 | Liability      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year (31.7) 0.0 0.0
Liability purchases 0.0 (17.2)  
Liability transfers 0.0 0.0  
Liability sales 0.0 0.0  
Liability, increase (decrease) in fv included in net income 8.3 (14.5)  
Balance at the end of the period (23.4) (31.7) (31.7)
Change in unrealized gains or losses 0.0 0.0  
Recurring | Level 3 | Liability | Loss Portfolio Transfer      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year (31.7) 0.0 0.0
Liability purchases 0.0 (17.2)  
Liability transfers 0.0 0.0  
Liability sales 0.0 0.0  
Liability, increase (decrease) in fv included in net income     (14.5)
Balance at the end of the period (23.4) (31.7) (31.7)
Change in unrealized gains or losses 0.0 0.0  
Recurring | Commercial mortgage loans | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) (10.5) (0.5)  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 295.0 312.1  
Recurring | Middle market loans | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) (2.0) (2.1)  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 102.1 106.9  
Recurring | Asset-backed | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) (1.1) (2.0)  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 58.4 66.8  
Recurring | Global corporate securities | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) (0.1) 0.0  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 14.8 15.0  
Recurring | Equity securities | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) 0.0 0.0  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 12.1 6.6  
Recurring | Short-term investments | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in unrealized investment gains (losses) 0.0 0.0  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the end of the year 0.0 25.6  
Assets | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 533.0 307.1 307.1
Purchases and issuances 23.0 378.2  
Settlements and sales (58.4) (147.4)  
Increase (decrease) in fair value included in net income (8.5) (4.9)  
Balance at the end of the year     533.0
Transfers in/(out) (6.7) 0.0  
Assets | Recurring | Commercial mortgage loans | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 312.1 211.5 211.5
Purchases and issuances 15.9 215.7  
Settlements and sales (23.2) (113.1)  
Increase (decrease) in fair value included in net income (9.8) (2.0)  
Balance at the end of the year     312.1
Transfers in/(out) 0.0 0.0  
Assets | Recurring | Middle market loans | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 106.9 65.3 65.3
Purchases and issuances 0.1 61.8  
Settlements and sales (5.4) (19.3)  
Increase (decrease) in fair value included in net income 0.5 (0.9)  
Balance at the end of the year     106.9
Transfers in/(out) 0.0 0.0  
Assets | Recurring | Asset-backed | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 66.8 26.7 26.7
Purchases and issuances 0.0 54.5  
Settlements and sales (3.8) (12.6)  
Increase (decrease) in fair value included in net income 0.9 (1.8)  
Balance at the end of the year     66.8
Transfers in/(out) (5.5) 0.0  
Assets | Recurring | Global corporate securities | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 15.0 0.0 0.0
Purchases and issuances 0.0 15.1  
Settlements and sales (0.2) 0.0  
Increase (decrease) in fair value included in net income 0.0 (0.1)  
Balance at the end of the year     15.0
Transfers in/(out) 0.0 0.0  
Assets | Recurring | Equity securities | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 6.6 3.6 3.6
Purchases and issuances 7.0 5.5  
Settlements and sales (0.2) (2.4)  
Increase (decrease) in fair value included in net income (0.1) (0.1)  
Balance at the end of the year     6.6
Transfers in/(out) (1.2) 0.0  
Assets | Recurring | Preference shares | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Transfers in/(out)   0.0  
Assets | Recurring | Short-term investments | Level 3      
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]      
Balance at the beginning of the year 25.6 0.0 0.0
Purchases and issuances 0.0 25.6  
Settlements and sales (25.6) 0.0  
Increase (decrease) in fair value included in net income 0.0 0.0  
Balance at the end of the year     $ 25.6
Transfers in/(out) $ 0.0 $ 0.0