Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 10.7	$ 23.3	$ 13.3	$ 16.0
Restricted cash and cash equivalents	384.7	410.9	429.0	380.2
Total cash, cash equivalents, restricted cash and restricted cash equivalents	$ 395.4	$ 434.2	$ 442.3	$ 396.2