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Schedule I Financial Statements of Parent Company Schedule I Financial Statements of Parent Company - Dividends (Details) - USD ($)
$ in Millions
7 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Parent      
Condensed Financial Statements, Captions [Line Items]      
Cash dividends from subsidiaries $ 236.0 $ 355.0 $ 460.0