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Supplemental Disclosures of Cash Flow Information - Cash Equivalents And Restricted Cash (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Cash And Cash Equivalents [Abstract]      
Cash and cash equivalents $ 3,204.1 $ 664.6 $ 349.7
Restricted cash 3,170.9 $ 2,909.7 2,653.0
Total cash, cash equivalents and restricted cash $ 6,375.0   $ 3,002.7