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Debt - Summary of Debt (Parenthetical) (Details) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 21, 2019 | Dec. 13, 2017 | Sep. 05, 2014 | Oct. 22, 2013 | Dec. 31, 2020 | Dec. 31, 2019
Revolving Credit Facility, due August 2021 | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility, expiration date |  |  |  |  | Aug. 21, 2021 | Aug. 21, 2021
Stated interest rate |  |  |  |  | 0.00% | 0.00%
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  | 4.50% | 4.50% | 4.50%
Senior notes, discount |  |  |  |  | $ 0.6 | $ 0.8
Debt instrument, maturity date |  |  |  | Nov. 01, 2023 | 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% | 3.65%
Senior notes, discount |  |  |  |  | $ 0.5 | $ 0.6
Debt instrument, maturity date |  |  | Sep. 15, 2024 |  | 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% | 3.40%
Senior notes, discount |  |  |  |  | $ 1.3 | $ 1.3
Debt instrument, maturity date |  | Dec. 15, 2027 |  |  | Dec. 15, 2027 | Dec. 15, 2027
3.00% Senior Notes, due December 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 3.00%
3.00% Senior Notes, due December 2029 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  | 3.00% | 3.00%
Senior notes, discount |  |  |  |  | $ 0.6 | $ 0.7
Debt instrument, maturity date | Dec. 15, 2029 |  |  |  | Dec. 15, 2029 | Dec. 15, 2029
4.05% Senior Notes, due December 2049 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.05%
4.05% Senior Notes, due December 2049 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 4.05% |  |  |  | 4.05% | 4.05%
Senior notes, discount |  |  |  |  | $ 3.4 | $ 3.5
Debt instrument, maturity date | Dec. 15, 2049 |  |  |  | Dec. 15, 2049 | Dec. 15, 2049

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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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=117815213&loc=d3e19207-110258 + Details
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