Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 9.8	$ 42.9	$ 28.9
Restricted cash included in other current assets	5.3	70.1	25.6
Restricted cash included in other long-term assets	27.1	52.2	127.7
Cash, cash equivalents, and restricted cash	$ 42.2	$ 165.2	$ 182.2	$ 87.5