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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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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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Number of shares that have been repurchased during the period and are being held in treasury.

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