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Short-term Investments: Investment in Viking - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2014
Variable Interest Entity [Line Items]
Warrants	$ 0.0	$ 1.5
Investment in Viking common stock	$ 30.9	$ 32.8
Exercise price of warrants (USD per share)		$ 1.50	$ 125.08
Warrants
Variable Interest Entity [Line Items]
Value of warrants in Viking		$ 6.3
Viking Therapeutics, Inc.
Variable Interest Entity [Line Items]
Ownership interest (as a percent)	8.60%
Stock sold of equity method investee (in shares)	0.6

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