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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

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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