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7. Stockholders' Equity Treasury Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2022 | May 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares | 1,159,775 | 918,367 | 663,083 | 573,577 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 207.4 | $ 98.1 | $ 223.1 | $ 73.1 | $ 207.4 |
Treasury Stock, Shares, Acquired | 241,408 | 255,284 | 89,506 | 291,941 |  |
Treasury Stock Acquired, Average Cost Per Share | $ 375.63 | $ 489.65 | $ 558.60 | $ 342.55 |  |
Treasury Class-A [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  |  |  | (135,744) | (114,711)

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