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LEASES.
12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
LEASES LEASES.
All of our leases are operating leases and primarily consist of real estate leases for corporate offices, data centers, and other facilities. In December 2020, we announced that we signed a letter of intent for a long-term lease for our global headquarters in a different downtown location in Baltimore, Maryland. We plan to relocate our operations from our East Pratt Street offices in 2024.
As of December 31, 2020, the weighted-average remaining lease term on our leases is approximately 4.8 and the weighted-average discount rate used to measure the lease liabilities is 3.5%.
Operating lease expense was $32.1 million in 2020, $29.0 million in 2019, and $40.1 million in 2018. Charges related to our operating leases that are variable, including variable common area maintenance charges and other management-related costs, and not included in the measurement of the lease liabilities, were $9.3 million in 2020.

We made lease payments of $31.2 million during 2020. Our future undiscounted cash flows related to our operating leases and the reconciliation to the operating lease liability as of December 31, 2020, are as follows:
(in millions)2020
2021$35.3 
202232.8 
202329.9 
202442.9 
202514.8 
Thereafter12.6 
Total future undiscounted cash flows168.3 
Less: imputed interest to be recognized in lease expense(14.2)
Operating lease liabilities, as reported$154.1