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Summary of Significant Accounting Policies Equity Ownership (Details) - USD ($) $ in Millions | 3 Months Ended
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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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