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Business Combination (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 16, 2021
May 05, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]              
Contingent consideration     $ 24,000,000 $ 0 $ 24,000,000 $ 0 $ 0
Gain on bargain purchase     0 0 74,408,000 0  
Fair value adjustment on reserves, net              
Business Acquisition [Line Items]              
Present value of future insurance profits, expected amortization   $ 38,700,000          
NORCAL Group              
Business Acquisition [Line Items]              
Percentage of interest acquired 1.20% 98.80%          
Total acquisition consideration $ 3,100,000 $ 448,809,000          
Payments to acquire business   248,000,000          
Business combination, consideration transferred, equity interests issued and issuable   1,800,000          
Contingent consideration, maximum estimate   84,000,000          
Contingent consideration   24,000,000 24,000,000   24,000,000    
Proassurance actual revenue consolidation results     87,800,000   141,100,000    
Proassurance actual net loss consolidated results     1,700,000   (3,300,000)    
Transaction-related costs     $ 2,300,000 $ 500,000 $ 23,500,000 $ 1,600,000  
Gain on bargain purchase   74,408,000          
Deferred tax asset, net   46,759,000          
Initial base consideration   450,000,000          
Intangible assets   14,000,000          
Business combination, fair values adjustments on gross reserve   42,200,000          
Business combination, fair values adjustments on reinsurance recoverables   3,500,000          
Present value of future insurance profits, expected amortization   53,844,000          
NORCAL Group | Unearned premium VOBA, net              
Business Acquisition [Line Items]              
Present value of future insurance profits, expected amortization   11,676,000          
Estimated negative VOBA   12,400,000          
NORCAL Group | Fair value adjustment on reserves, net              
Business Acquisition [Line Items]              
Present value of future insurance profits, expected amortization   38,701,000          
Estimated negative VOBA   700,000          
NORCAL Group | DDR reserve VOBA              
Business Acquisition [Line Items]              
Present value of future insurance profits, expected amortization   3,467,000          
NORCAL Group | Contribution Certificates              
Business Acquisition [Line Items]              
Principal amount   191,000,000          
Debt instruments   $ 175,000,000