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Debt - Summary of Debt (Parenthetical) (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 21, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs |  | $ 1.4 |
Revolving Credit Facility, due August 2021 | Line Of Credit |  |  |
Debt Instrument [Line Items] |  |  |
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] |  |  |
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 |  | $ 0.5 | $ 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
3.05% Senior Notes, due October 2051 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.05% | 3.05% |
Senior notes, discount |  | $ 3.7 |
Debt instrument, maturity date | Oct. 31, 2051 | Oct. 31, 2051 |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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