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Leases (Notes)
12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease Disclosure
4. Leases

Components of lease expense for the year ended December 31, 2020 and 2019 were as follows (in millions):
20202019
Operating lease expense$32.9 $32.1 
Short-term lease expense6.6 2.1 
Variable lease expense6.4 5.8 
Total lease expense$45.9 $40.0 
Supplemental information related to leases for December 31, 2020 and 2019 (in millions):
20202019
Weighted-average remaining lease term of operating leases3.7 years4.2 years
Weighted-average discount rate of operating leases3.91 %4.26 %
Cash paid for operating lease liabilities$34.0$32.1

Maturities of operating lease liabilities at December 31, 2020 (in millions):
2021$32.4 
202225.9 
202320.1 
202412.7 
20255.4 
Thereafter2.7 
Total future minimum lease payments 99.2 
Less: imputed interest 6.9 
Total operating lease liabilities$92.3 

The Company has operating leases for corporate offices, branch offices and data centers. Two of these properties were owned indirectly in part by certain board members and an executive of the Company until they were sold to an unrelated party in June 2020. Rent expense for these properties for the period they were owned in part by related parties was $0.4 million, $1.2 million and $1.3 million for the years ended December 31, 2020, 2019 and 2018.

At December 31, 2020, the Company did not have any significant leases that had not yet commenced.