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Net Income Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Feb. 28, 2023 | Dec. 31, 2021
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |
Antidilutive options excluded from computation of diluted net income per share (in shares) | 0 |  |  | 200,000 |  |  | 100,000 | 100,000 |  |
Stock repurchase program, shares authorized (in shares) |  |  |  |  |  |  |  |  | 1,000,000,000 | 650,000
Share purchased under share repurchase program (in shares) | 77,329 |  |  | 86,667 |  |  | 753,399 | 563,334 |  |
Stock purchase program, cost of shares purchased | $ 27.8 | $ 173.4 | $ 60.1 | $ 27.2 | $ 28.6 | $ 147.1 | $ 261.3 | $ 202.9 |  |
Stock repurchase program, average price per share (in dollars per share) | $ 360.25 |  |  | $ 313.22 |  |  | $ 346.86 | $ 360.03 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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