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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]        
Cash and cash equivalents $ 4.1 $ 23.3 $ 383.5 $ 16.0
Restricted cash and cash equivalents 426.7 410.9 477.4 380.2
Total cash, cash equivalents, restricted cash and restricted cash equivalents $ 430.8 $ 434.2 $ 860.9 $ 396.2