Debt - Unsecured Senior Notes (Details) - Unsecured Debt - USD ($)	1 Months Ended
May 31, 2019	Dec. 31, 2020
Senior Notes 5.000% Due 2022
Debt Instrument [Line Items]
Fixed interest rate per annum		5.00%
Aggregate principal issued		$ 750,000,000
Senior Notes 3.75% Matures 2025
Debt Instrument [Line Items]
Fixed interest rate per annum		3.75%
Aggregate principal issued		$ 500,000,000
Senior Notes
Debt Instrument [Line Items]
Redemption price percentage	101.00%

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
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- 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))
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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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