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Goodwill and Intangible Assets Goodwill (Details) - USD ($)
12 Months Ended
Jun. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]        
Goodwill, Impaired, Accumulated Impairment Loss   $ 0    
Amortization of intangible assets   57,700,000 $ 56,900,000 $ 66,300,000
Protective Insurance Corporation | Trade name        
Goodwill [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 3,600,000 $ 3,600,000    
Intangible assets finite lives 2 years 2 years