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7. Stockholders' Equity Treasury Shares (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Aug. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares | 193,150 | 14,239 | 5,039 | 3,539 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 201.1 | $ 0.4 | $ 2.4 | $ 2.7 |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 18.0 | $ 250.0
Treasury Stock, Shares, Acquired | 178,911 | 9,200 | 1,500 | 2,500 |  |
Treasury Stock Acquired, Average Cost Per Share | $ 273.39 | $ 221.45 | $ 221.82 | $ 220.02 |  |
Treasury Class-A [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares |  |  |  |  | 582 | 179,493
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  |  |  | 12,740 |
Treasury Class B [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares |  |  |  |  | 917 | 917

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