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Leases Leases (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Components of Lease Expense
The components of lease expense are as follows (in millions):
SuccessorPredecessor
Year Ended December 31, 2023Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021
Long-term operating lease cost$24.6 $13.4 $12.9 $9.1 
Short-term operating lease cost13.2 15.2 14.3 6.3 
Variable lease cost (1)
11.3 1.0 1.0 0.7 
Total operating lease cost$49.1 $29.6 $28.2 $16.1 
Supplemental Balance Sheet Information
Supplemental balance sheet information related to our operating leases is as follows (in millions, except lease term and discount rate):
December 31, 2023December 31, 2022
Operating lease right-of-use assets$74.6$21.0
Current lease liability$27.2$9.4
Long-term lease liability48.913.8
Total operating lease liabilities$76.1$23.2
Weighted-average remaining lease term (in years)3.65.0
Weighted-average discount rate (1)
8.21 %7.48 %

(1)Represents our estimated incremental borrowing cost on a secured basis for similar terms as the underlying leases.

Supplemental cash flow information related to our operating leases is as follows (in millions):

SuccessorPredecessor
Year Ended December 31, 2023Year Ended December 31, 2022Eight Months Ended December 31, 2021Four Months Ended April 30, 2021
ROU assets obtained in exchange for operating lease liabilities
$80.3 $14.7 $0.9 $5.5 
Cash paid for amounts included in the measurement of our operating lease liabilities
$26.2 $14.0 $11.7 $7.1 
Maturities of Lease Liabilities
Maturities of lease liabilities as of December 31, 2023 were as follows (in millions):
2024$32.4 
202520.5 
202619.1 
202710.0 
20282.4 
Thereafter3.7 
Total lease payments$88.1 
Less imputed interest(12.0)
Total$76.1