Debt - Narrative (Details) - Senior Notes - USD ($)	Oct. 09, 2020	Nov. 30, 2020
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000.0
2.77% Coupon, 7 Year Senior Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 70,000,000.0
Debt instrument, term	7 years
Interest rate stated percentage	2.77%
3.17% Coupon, 12 Year Senior Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 80,000,000.0
Debt instrument, term	12 years
Interest rate stated percentage	3.17%
Unsecured Senior Notes Due January 2021
Debt Instrument [Line Items]
Interest rate stated percentage		5.42%

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Details

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