Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 280.2	$ 288.8
Restricted cash - current	$ 40.1	$ 62.6
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List]	Prepaid expenses and other current assets	Prepaid expenses and other current assets
Restricted cash - noncurrent		$ 6.2
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]	Other noncurrent assets	Other noncurrent assets
Total cash, cash equivalents and restricted cash	$ 320.3	$ 357.6