Description of Business and Basis of Presentation - Summary of Reconciliation of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Aug. 31, 2025	May 31, 2025	Aug. 31, 2024
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract]
Cash and cash equivalents, beginning of period	$ 38.0	$ 36.0	$ 40.2
Restricted cash, beginning of period	54.9	0.0	0.0
Cash, cash equivalents, and restricted cash at beginning of period	92.9	36.0	40.2
Cash and cash equivalents, end of period	78.3	38.0	36.0
Restricted cash, end of period	0.0	54.9	0.0
Cash, cash equivalents, and restricted cash at end of period	$ 78.3	$ 92.9	$ 36.0