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Debt (Narrative) (Details) - USD ($)		1 Months Ended			9 Months Ended		12 Months Ended
	May 05, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2017	Dec. 31, 2020
Debt Instrument [Line Items]
Repayments of outstanding mortgage loans					$ 36,113,000	$ 1,127,000
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of lines of credit		$ 15,000,000
Contribution Certificates | NORCAL Group
Debt Instrument [Line Items]
Principal amount	$ 191,000,000
Debt instrument fair value	175,000,000
Debt instrument, premium	$ 16,000,000
Debt instrument term	10 years
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit borrowing capacity					250,000,000
Accordion feature borrowing capacity					50,000,000
Line of credit, borrowing capacity including accordion feature					300,000,000
Outstanding borrowing					$ 0			$ 0
Mortgage loans
Debt Instrument [Line Items]
Debt instrument term							10 years
Repayments of outstanding mortgage loans			$ 19,700,000	$ 15,600,000
Mortgage loans | ProAssurance Indemnity
Debt Instrument [Line Items]
Total principal payments							$ 17,900,000
Mortgage loans | PICA
Debt Instrument [Line Items]
Total principal payments							$ 22,600,000

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Debt, Long-term and Short-term, Combined Amount, Gross

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Face (par) amount of debt instrument at time of issuance.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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