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Fair Value Measurements Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commercial mortgage loans    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year $ 163.6  
Balance at the end of the year 211.5 $ 163.6
Middle market loans    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 112.1  
Balance at the end of the year 65.4 112.1
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 5.0  
Balance at the end of the year 3.6 5.0
Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) (2.2) (5.2)
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 299.3  
Balance at the end of the year 307.1 299.3
Recurring | Commercial mortgage loans | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) (0.5) 0.1
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 163.6  
Balance at the end of the year 211.5 163.6
Recurring | Middle market loans | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) (1.5) (5.3)
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 112.1  
Balance at the end of the year 65.3 112.1
Recurring | Asset-backed | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) (0.2) 0.0
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 18.6  
Balance at the end of the year 26.7 18.6
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 beginning of the year 5.0  
Balance at the end of the year 3.6 5.0
Recurring | Preference shares | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) 0.0  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the end of the year 0.0  
Assets | Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 299.3 279.5
Purchases and issuances 205.1 93.0
Settlements and sales (182.2) (64.3)
Increase (decrease) in fair value included in net income 4.2 (17.2)
Balance at the end of the year   299.3
Transfers in/(out) (19.5) 8.3
Assets | Recurring | Commercial mortgage loans | Level 3    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 163.6 156.4
Purchases and issuances 169.9 79.7
Settlements and sales (122.5) (59.4)
Increase (decrease) in fair value included in net income 0.5 (13.1)
Balance at the end of the year   163.6
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 112.1 111.7
Purchases and issuances 5.6 0.9
Settlements and sales (56.1) (4.8)
Increase (decrease) in fair value included in net income 3.7 (4.0)
Balance at the end of the year   112.1
Transfers in/(out) 0.0 8.3
Assets | Recurring | Asset-backed | Level 3    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 18.6 8.7
Purchases and issuances 10.0 10.0
Settlements and sales (1.8) 0.0
Increase (decrease) in fair value included in net income (0.1) (0.1)
Balance at the end of the year   18.6
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 5.0 2.7
Purchases and issuances 0.1 2.4
Settlements and sales (1.6) (0.1)
Increase (decrease) in fair value included in net income 0.1 0.0
Balance at the end of the year   5.0
Transfers in/(out) 0.0 0.0
Assets | Recurring | Preference shares | Level 3    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 0.0  
Purchases and issuances 19.5  
Settlements and sales 0.0  
Increase (decrease) in fair value included in net income 0.0  
Balance at the end of the year   $ 0.0
Transfers in/(out) $ (19.5)