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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Financial Instruments Measured at Fair Value on Nonrecurring Basis | The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis. The table excludes carrying amounts for cash and cash equivalents and restricted cash, accounts receivable and contract assets, accounts payable, contract liabilities and other current liabilities, and other assets and liabilities that approximate fair value due to relatively short periods to maturity (in millions):
March 31, 2024 |  |  |  |  |  | Fair Value Measurement Using:
| Carrying Value |  | Estimated Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |
Measurement alternative investment (1) |  | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.9 |
Total assets not accounted for at fair value |  | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.9 |
Liabilities |  |  |  |  |  |  |  |  |  |
Debt obligations (2) |  | $ | 674.8 |  |  | $ | 570.2 |  |  | $ | 265.9 |  |  | $ | 304.3 |  |  | $ | — |
Total liabilities not accounted for at fair value |  | $ | 674.8 |  |  | $ | 570.2 |  |  | $ | 265.9 |  |  | $ | 304.3 |  |  | $ | — |
(1) Refer to Note 6. Investments for additional information. (2) Excludes lease obligations accounted for under ASC 842, Leases.
December 31, 2023 |  |  |  |  |  | Fair Value Measurement Using:
| Carrying Value |  | Estimated Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |
Measurement alternative investment (1) |  | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |  |  | $ | — |
Total assets not accounted for at fair value |  | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |
Debt obligations (2) |  | $ | 707.4 |  |  | $ | 621.8 |  |  | $ | 283.2 |  |  | $ | 338.6 |  |  | $ | — |
Total liabilities not accounted for at fair value |  | $ | 707.4 |  |  | $ | 621.8 |  |  | $ | 283.2 |  |  | $ | 338.6 |  |  | $ | — |
(1) Refer to Note 6. Investments for additional information. (2) Excludes lease obligations accounted for under ASC 842, Leases.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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