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7. Stockholders' Equity Treasury Shares (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended						12 Months Ended
	Mar. 31, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 30, 2019	May 31, 2019	Nov. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares	573,577	281,636	259,293		218,571	193,150			244,548
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 73.1	$ 173.1	$ 181.1		$ 193.7	$ 201.1	$ 273.1		$ 186.1
Stock Repurchase Program, Authorized Amount							$ 200.0			$ 250.0
Treasury Stock, Shares, Acquired	291,941	22,343	14,745	25,977	25,421	178,911
Treasury Stock Acquired, Average Cost Per Share	$ 342.55	$ 358.04	$ 339.05	$ 292.01	$ 291.70	$ 273.39
Employee Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Issued During Period, Shares, Treasury Stock Reissued							(19,755)
Treasury Class-A [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Issued During Period, Shares, Treasury Stock Reissued							(117,423)	(118,910)

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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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Amount of stock repurchase plan authorized.

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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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