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Equity-Method Eligible Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity Method Investee        
Schedule of Equity Method Investments [Line Items]        
Proceeds from dividends received $ 13.0 $ 63.9 $ 37.7 $ 85.3