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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Accounting Policies [Abstract]        
Cash and cash equivalents $ 159.7 $ 13.2 $ 3.1 $ 7.7
Restricted cash and cash equivalents 556.6 457.7 435.1 410.0
Total cash, cash equivalents, restricted cash and restricted cash equivalents $ 716.3 $ 470.9 $ 438.2 $ 417.7