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Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Restricted Cash and Cash Equivalents [Abstract]    
Cash and cash equivalents $ 415.1 $ 112.3
Restricted cash 3.2 3.2
Total cash and cash equivalents and restricted cash $ 418.3 $ 115.5