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Debt - Summary of Debt (Parenthetical) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Revolving Credit Facility, due August 2021 | Line Of Credit
Debt Instrument [Line Items]
Stated interest rate	0.00%	0.00%
Credit facility, expiration date	Jun. 30, 2021	Jun. 30, 2021
Debt instrument, maturity date	Aug. 21, 2021	Aug. 21, 2021
Revolving Credit Facility, due June 2026 | Line Of Credit
Debt Instrument [Line Items]
Stated interest rate	0.00%	0.00%
Credit facility, expiration date	Jun. 30, 2026	Jun. 30, 2026
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%
Senior notes, discount	$ 0.5	$ 0.6
Debt instrument, maturity date	Nov. 01, 2023	Nov. 01, 2023
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.65%	3.65%
Senior notes, discount	$ 0.4	$ 0.5
Debt instrument, maturity date	Sep. 15, 2024	Sep. 15, 2024
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.40%	3.40%
Senior notes, discount	$ 1.1	$ 1.2
Debt instrument, maturity date	Dec. 15, 2027	Dec. 15, 2027
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.00%	3.00%
Senior notes, discount	$ 0.6	$ 0.6
Debt instrument, maturity date	Dec. 15, 2029	Dec. 15, 2029
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.05%	4.05%
Senior notes, discount	$ 3.4	$ 3.4
Debt instrument, maturity date	Dec. 15, 2049	Dec. 15, 2049

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- Definition

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

+ References

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-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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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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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount, after accumulated amortization, of debt discount.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Date the credit facility terminates, in CCYY-MM-DD format.

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