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Basis of Presentation and Significant Accounting Policies (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Jan. 01, 2021
USD ($)
Securities Financing Transaction      
Number of operating segments | segment 3    
Securities sold under agreement to repurchase, cash received (in percent) 95.00%    
Securities sold under agreements to repurchase $ 95.2    
Securities sold under agreements to repurchase, accrued interest   $ 0.0  
Retained earnings (1,500.4) (1,524.9)  
Accumulated other comprehensive income 10.2 10.2  
Adjustments | Scenario, Plan      
Securities Financing Transaction      
Retained earnings     $ 5.0
Adjustments | Scenario, Plan | Market Risk      
Securities Financing Transaction      
Accumulated other comprehensive income     (15.0)
Adjustments | Scenario, Plan | Minimum | Discount Rate      
Securities Financing Transaction      
Accumulated other comprehensive income     (475.0)
Adjustments | Scenario, Plan | Minimum | Deferred Acquisition Costs      
Securities Financing Transaction      
Accumulated other comprehensive income     70.0
Adjustments | Scenario, Plan | Maximum | Discount Rate      
Securities Financing Transaction      
Accumulated other comprehensive income     (525.0)
Adjustments | Scenario, Plan | Maximum | Deferred Acquisition Costs      
Securities Financing Transaction      
Accumulated other comprehensive income     $ 75.0
Fair Value      
Securities Financing Transaction      
Securities sold under agreements to repurchase $ 95.8 $ 0.0