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Condensed Parent Only Financial Statements, Condensed Statements of Cash Flows (Parenthetical) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]      
Distributions from consolidated subsidiaries $ 387.2 $ 1,152.4 $ 918.5