Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 10.3	$ 10.6
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	19.5	28.8
Supplemental Lease Disclosures [Abstract]
Operating lease liabilities arising from obtaining operating lease assets	0.0	2.4
Cash paid for amounts included in the measurement of operating lease liabilities	2.1	2.4
Finance lease liabilities arising from obtaining finance lease assets	1.0	8.8
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	101.6	31.5	$ 82.4
Restricted cash included in Other assets	18.3	18.6	18.3
Total cash, cash equivalents and restricted cash presented on our Statements of Consolidated Cash Flows	$ 119.9	$ 50.1	$ 100.7	$ 71.3