Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 17.6	$ 23.3	$ 45.7	$ 16.0
Restricted cash and cash equivalents	481.1	410.9	538.5	380.2
Total cash, cash equivalents, restricted cash and restricted cash equivalents	$ 498.7	$ 434.2	$ 584.2	$ 396.2