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7. Stockholders' Equity Treasury Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2019 | Aug. 31, 2019 | Jun. 30, 2019 | May 31, 2019 | Nov. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares | 281,636 | 259,293 | 244,548 | 218,571 | 193,150 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 173.1 | $ 181.1 | $ 186.1 | $ 193.7 | $ 201.1 |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 250.0 |
Treasury Stock, Shares, Acquired | 22,343 | 14,745 | 25,977 | 25,421 | 178,911 |  |
Treasury Stock Acquired, Average Cost Per Share | $ 358.04 | $ 339.05 | $ 292.01 | $ 291.70 | $ 273.39 |  |
Treasury Class-A [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  |  |  |  | (118,910) |
Treasury Class B [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares |  |  |  |  |  | 0 | 917
Employee Stock [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  |  |  |  | (19,755) |

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