Maximum consolidated leverage ratio permitted under debt agreements.

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Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option

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Line of Credit Facility, Accordion Feature, Increase Limit

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The carrying value as of the balance sheet date of the current portion 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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Debt (Narrative) (Details)				12 Months Ended
Debt (Narrative) (Details)	Apr. 14, 2020 USD ($)	Dec. 04, 2015 USD ($)	Dec. 19, 2014 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€)	Apr. 10, 2020 USD ($)	Apr. 02, 2020 USD ($)	Mar. 23, 2020 USD ($)	Mar. 22, 2020 USD ($)	Mar. 14, 2019 USD ($)	Dec. 31, 2015 EUR (€)	Sep. 30, 2014 USD ($)	Jul. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Line of Credit Facility [Line Items]
Outstanding credit facility balance				$ 0	$ 288,765,000
Interest paid				$ 32,400,000	29,700,000	$ 34,700,000
Prudential
Line of Credit Facility [Line Items]
Borrowing capacity								$ 425,000,000
MetLife
Line of Credit Facility [Line Items]
Borrowing capacity										$ 300,000,000	$ 150,000,000
Prime Rate \| Minimum
Line of Credit Facility [Line Items]
Credit spread during period				0.375%
Senior Notes
Line of Credit Facility [Line Items]
Consolidated leverage ratio under credit facility & note payable, maximum				3.50%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument, term	3 years	5 years
Borrowing capacity	$ 1,000,000,000	$ 850,000,000
Accordion feature, increase limit	250,000,000
Accordion feature, higher borrowing capacity option	1,250,000,000
Revolving Credit Facility, Individual Borrowings \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, term				30 days
Revolving Credit Facility, Individual Borrowings \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, term				180 days
Amended And Restated Unsecured Short Term Revolving Credit Facility
Line of Credit Facility [Line Items]
Outstanding credit facility balance				$ 0	$ 288,800,000
Stated interest rate				2.50%			2.50%
Credit Facility weighted average interest rates on outstanding balance					2.78%
Reduction of credit facility availability				$ 1,400,000	$ 1,400,000
Consolidated leverage ratio under credit facility & note payable, maximum				3.50%
Amended And Restated Unsecured Short Term Revolving Credit Facility \| Minimum
Line of Credit Facility [Line Items]
Commitment fees				0.20%
Amended And Restated Unsecured Short Term Revolving Credit Facility \| Maximum
Line of Credit Facility [Line Items]
Commitment fees				0.375%
Amended And Restated Unsecured Short Term Revolving Credit Facility \| LIBOR \| Minimum
Line of Credit Facility [Line Items]
Stated interest rate				1.00%			1.00%
Credit spread during period				1.375%
Amended And Restated Unsecured Short Term Revolving Credit Facility \| LIBOR \| Maximum
Line of Credit Facility [Line Items]
Credit spread during period				2.00%
Amended And Restated Unsecured Short Term Revolving Credit Facility \| Prime Rate \| Minimum
Line of Credit Facility [Line Items]
Stated interest rate				2.00%			2.00%
Amended And Restated Unsecured Short Term Revolving Credit Facility \| Prime Rate \| Maximum
Line of Credit Facility [Line Items]
Credit spread during period				1.00%
2023 Series A Notes and 2025 Series B Notes \| Senior Notes
Line of Credit Facility [Line Items]
Principal Amount																$ 150,000,000
2023 Series A Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				3.94%			3.94%									3.94%
Principal Amount				$ 75,000,000												$ 75,000,000
2025 Series B Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				4.04%			4.04%									4.04%
Principal Amount				$ 75,000,000												$ 75,000,000
2026 Senior Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				3.72%			3.72%							3.72%
Principal Amount				$ 75,000,000										$ 75,000,000
2021 Series A Notes and 2024 Series B Notes \| Senior Notes
Line of Credit Facility [Line Items]
Principal Amount															$ 125,000,000
2021 Series A Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				3.32%			3.32%								3.32%
Principal Amount				$ 50,000,000											$ 50,000,000
2024 Series B Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				3.76%			3.76%								3.76%
Principal Amount				$ 75,000,000											$ 75,000,000
2025 Series C Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				1.785%			1.785%						1.785%
Principal Amount \| €							€ 88,857,000						€ 88,900,000
Prudential 2030 Series D Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				2.50%			2.50%	2.50%
Principal Amount	$ 75,000,000			$ 75,000,000
2022 Series A Notes and 2027 Series B Notes \| Senior Notes
Line of Credit Facility [Line Items]
Principal Amount			$ 150,000,000
2022 Series A Notes \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, term			7 years
Stated interest rate			3.25%	3.25%			3.25%
Principal Amount			$ 75,000,000	$ 75,000,000
2027 Series B Notes \| Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, term			12 years
Stated interest rate			3.72%	3.72%			3.72%
Principal Amount			$ 75,000,000	$ 75,000,000
2029 Series C Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				4.19%			4.19%					4.19%
Principal Amount				$ 100,000,000								$ 100,000,000
MetLife 2030 Series D Notes \| Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				2.50%			2.50%		2.50%
Principal Amount				$ 125,000,000					$ 125,000,000