Equity Incentive Plan Rollforward of Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Options, Outstanding, Number, Beginning	474,103
Options, Grants in Period, Net of Forfeitures	28,116
Options, Exercises in Period	(95,549)
Options, Forfeitures in Period	(886)
Options, Outstanding, Number, Ending	405,784
Options, Exercisable, Number	309,558
Aggregate Intrinsic Value [Abstract]
Options, Outstanding, Intrinsic Value	$ 480.8	$ 350.6
Options, Exercisable, Intrinsic Value	$ 404.1
Weighted Average Exercise Price [Abstract]
Options, Outstanding, Weighted Average Exercise Price, Beginning	$ 400.21
Options, Grants in Period, Weighted Average Exercise Price	1,390.31
Options, Exercises in Period, Weighted Average Exercise Price	214.17
Options, Forfeitures in Period, Weighted Average Exercise Price	546.20
Options, Outstanding, Weighted Average Exercise Price, Ending	512.30
Options, Exercisable, Weighted Average Exercise Price	$ 391.69