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Leases Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Components of Lease Expense
The components of lease expense during the years ended December 31, 2020 and 2019 are as follows (in millions):
20202019
Long-term operating lease cost$23.3 $29.5 
Short-term operating lease cost19.2 12.2 
Sublease income(2.3)(2.4)
Total operating lease cost$40.2 $39.3 
Supplemental Balance Sheet Information
Supplemental balance sheet information related to our operating leases is as follows (in millions, except lease term and discount rate) as of December 31, 2020 and 2019:
20202019
Operating lease right-of-use assets$35.8 $58.1 
Current lease liability$15.7 $21.1 
Long-term lease liability21.6 51.8 
Total operating lease liabilities$37.3 $72.9 
Weighted-average remaining lease term (in years)4.35.1
Weighted-average discount rate (1)
8.24 %8.23 %

(1)Represents our estimated incremental borrowing cost on a secured basis for similar terms as the underlying leases.
Maturities of Lease Liabilities
Maturities of lease liabilities as of December 31, 2020 were as follows (in millions):
2021$17.8 
202212.0 
20233.0 
20242.2 
20252.0 
Thereafter9.0 
Total lease payments$46.0 
Less imputed interest8.7 
Total$37.3