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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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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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