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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, 2020
Dec. 31, 2019
Commercial mortgage loans    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year $ 156.6  
Balance at the end of the year 163.6 $ 156.6
Middle market loans    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 111.7  
Balance at the end of the year 112.1 111.7
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 2.7  
Balance at the end of the year 5.0 2.7
Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) (5.2) 0.3
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 279.5  
Balance at the end of the year 299.3 279.5
Balance at the beginning of the period 0.0 4.6
Balance at the end of the period   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) 0.1 0.3
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 156.4  
Balance at the end of the year 163.6 156.4
Recurring | Middle market loans | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses) (5.3) 0.0
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 111.7  
Balance at the end of the year 112.1 111.7
Recurring | Asset-backed | 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 8.7  
Balance at the end of the year 18.6 8.7
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 2.7  
Balance at the end of the year 5.0 2.7
Assets | Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the year 279.5 0.0
Purchases and issuances 93.0 301.5
Settlements and sales (64.3) (23.9)
Increase (decrease) in fair value included in net income (17.2) 1.8
Balance at the end of the year   279.5
Transfers in/(out) 8.3 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 156.4 0.0
Purchases and issuances 79.7 174.7
Settlements and sales (59.4) (20.1)
Increase (decrease) in fair value included in net income (13.1) 1.7
Balance at the end of the year   156.4
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 111.7 0.0
Purchases and issuances 0.9 115.5
Settlements and sales (4.8) (3.8)
Increase (decrease) in fair value included in net income (4.0) 0.1
Balance at the end of the year   111.7
Transfers in/(out) 8.3 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 8.7 0.0
Purchases and issuances 10.0 8.7
Settlements and sales 0.0 0.0
Increase (decrease) in fair value included in net income (0.1) 0.0
Balance at the end of the year   8.7
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 2.7 0.0
Purchases and issuances 2.4 2.7
Settlements and sales (0.1) 0.0
Increase (decrease) in fair value included in net income 0.0 0.0
Balance at the end of the year   2.7
Transfers in/(out) 0.0 0.0
Liability | Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses), liability 0.0 0.0
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the period 0.0  
Liability purchases 0.0 0.0
Liability sales 0.0 (7.7)
Liability, increase (decrease) in fv included in net income 0.0 3.1
Balance at the end of the period 0.0 0.0
Liability transfers 0.0 0.0
Liability | Silverton | Recurring | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Change in unrealized investment gains (losses), liability 0.0  
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward]    
Balance at the beginning of the period 0.0 4.6
Liability purchases 0.0 0.0
Liability sales 0.0 (7.7)
Liability, increase (decrease) in fv included in net income 0.0 3.1
Balance at the end of the period 0.0 0.0
Liability transfers $ 0.0 $ 0.0