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Fair Value of Financial Instruments (Tables)
3 Months Ended
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, 2024Fair Value Measurement Using:
Carrying ValueEstimated Fair ValueLevel 1Level 2Level 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, 2023Fair Value Measurement Using:
Carrying ValueEstimated Fair ValueLevel 1Level 2Level 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.