Summary of Significant Accounting Policies Equity Ownership (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Equity Securities, FV-NI, Gain (Loss)	$ 282.3	$ 0.0
Investment Owned, Balance, Shares	95,389,721
Proceeds from Equity Method Investment, Distribution	$ 16.7
Equity in earnings of unconsolidated affiliates	$ 0.0	53.2
Equity Securities Sold During Period	21,750,000
Proceeds from Sales of Equity Securities	$ 246.0
Distributions from unconsolidated affiliates	$ 0.0	$ 18.3

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