Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 42.9	$ 28.9	$ 16.3
Restricted cash included in other current assets	70.1	25.6	19.6
Restricted cash included in other long-term assets	52.2	127.7	51.6
Cash, cash equivalents, and restricted cash	$ 165.2	$ 182.2	$ 87.5	$ 72.6