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Corporate Borrowings - Narrative (Details) - USD ($)		6 Months Ended		12 Months Ended
	Apr. 01, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2017	May 14, 2021	Dec. 31, 2020	Feb. 14, 2020
Debt Instrument [Line Items]
Outstanding borrowings under credit facility		$ 230,294,000					$ 0
Total indebtedness outstanding		272,216,000					40,000,000
Proceeds from credit agreement - revolver		242,300,000	$ 54,700,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Contingent increase in borrowing capacity						$ 100,000,000
Credit Agreement - Revolver, 1.09% (variable rate) due 2025
Debt Instrument [Line Items]
Outstanding borrowings under credit facility						$ 400,000,000		$ 300,000,000
Credit Agreement - Revolver, 1.09% (variable rate) due 2025 | Luxco
Debt Instrument [Line Items]
Proceeds from credit agreement - revolver	$ 242,300,000
Credit Agreement
Debt Instrument [Line Items]
New loan fees		666,000
Credit Agreement - Revolver, 1.09% (variable rate) due 2025 | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total indebtedness outstanding		232,000,000					0
Remaining borrowing capacity		168,000,000
Note Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Term loan face value		20,000,000
Note Purchase Agreement | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Term loan face value		105,000,000
Prudential Note Purchase Agreement, 3.53% (fixed rate) due 2027 | Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding		20,000,000					20,000,000
Proceeds from issuance of debt					$ 20,000,000
Prudential Note Purchase Agreement, 3.80% (fixed rate) due 2029 | Secured Debt
Debt Instrument [Line Items]
Total indebtedness outstanding		$ 20,000,000					$ 20,000,000
Proceeds from issuance of debt				$ 20,000,000

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Line Of Credit Facility, Contingent Increase In Borrowing Capacity

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Amount of the fee that accompanies borrowing money under the debt instrument.

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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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