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Lease Obligations
 12 Months Ended
Dec. 31, 2022
Leases [Abstract]  
Lease Obligations Lease Obligations
Finance Leases
The gross amount of assets held under finance leases as of December 31, 2022 and 2021 totaled $720.1 million and $653.5 million, respectively. Assets held under finance leases, net of accumulated depreciation, totaled $535.3 million and $468.5 million as of December 31, 2022 and 2021, respectively. Depreciation expense associated with finance leases totaled $91.7 million, $80.1 million and $68.0 million for the years ended December 31, 2022, 2021 and 2020, respectively.
Operating Leases
Operating lease additions for the years ended December 31, 2022 and 2021 totaled $119.1 million and $172.9 million, respectively, of which acquisition-related additions totaled $32.4 million and $149.3 million, respectively. Operating lease additions for the year ended December 31, 2020 totaled $28.0 million.
For the years ended December 31, 2022, 2021 and 2020, rent expense for leases that have terms in excess of one year totaled approximately $134.1 million, $107.7 million and $113.0 million, respectively, of which $11.1 million, $10.1 million and $10.0 million, respectively, represented variable lease costs. The Company also incurred rent expense for leases with terms of one year or less totaling approximately $377.8 million, $494.7 million and $312.0 million for the years ended December 31, 2022, 2021, and 2020, respectively. Rent expense for operating leases is generally consistent with the amount of the related payments, which payments are included within operating activities in the consolidated statements of cash flows.
Additional Lease Information
Future minimum lease commitments as of December 31, 2022 were as follows (in millions):
 Finance
 Leases		Operating Leases
2023$171.0 $102.0 
2024122.4 79.0 
202585.7 53.0 
202629.6 35.0 
20273.5 16.8 
Thereafter
0.6 31.9 
Total minimum lease payments
$412.8 $317.7 
Less amounts representing interest
(23.7)(27.1)
Total lease obligations, net of interest
$389.1 $290.6 
Less current portion
158.2 96.5 
Long-term portion of lease obligations, net of interest
$230.9 $194.1 
As of December 31, 2022, finance leases had a weighted average remaining lease term of 2.8 years and a weighted average discount rate of 4.0%, and non-cancelable operating leases had a weighted average remaining lease term of 4.5 years and a weighted average discount rate of 3.6%.
Lease Obligations Lease Obligations
Finance Leases
The gross amount of assets held under finance leases as of December 31, 2022 and 2021 totaled $720.1 million and $653.5 million, respectively. Assets held under finance leases, net of accumulated depreciation, totaled $535.3 million and $468.5 million as of December 31, 2022 and 2021, respectively. Depreciation expense associated with finance leases totaled $91.7 million, $80.1 million and $68.0 million for the years ended December 31, 2022, 2021 and 2020, respectively.
Operating Leases
Operating lease additions for the years ended December 31, 2022 and 2021 totaled $119.1 million and $172.9 million, respectively, of which acquisition-related additions totaled $32.4 million and $149.3 million, respectively. Operating lease additions for the year ended December 31, 2020 totaled $28.0 million.
For the years ended December 31, 2022, 2021 and 2020, rent expense for leases that have terms in excess of one year totaled approximately $134.1 million, $107.7 million and $113.0 million, respectively, of which $11.1 million, $10.1 million and $10.0 million, respectively, represented variable lease costs. The Company also incurred rent expense for leases with terms of one year or less totaling approximately $377.8 million, $494.7 million and $312.0 million for the years ended December 31, 2022, 2021, and 2020, respectively. Rent expense for operating leases is generally consistent with the amount of the related payments, which payments are included within operating activities in the consolidated statements of cash flows.
Additional Lease Information
Future minimum lease commitments as of December 31, 2022 were as follows (in millions):
 Finance
 Leases		Operating Leases
2023$171.0 $102.0 
2024122.4 79.0 
202585.7 53.0 
202629.6 35.0 
20273.5 16.8 
Thereafter
0.6 31.9 
Total minimum lease payments
$412.8 $317.7 
Less amounts representing interest
(23.7)(27.1)
Total lease obligations, net of interest
$389.1 $290.6 
Less current portion
158.2 96.5 
Long-term portion of lease obligations, net of interest
$230.9 $194.1 
As of December 31, 2022, finance leases had a weighted average remaining lease term of 2.8 years and a weighted average discount rate of 4.0%, and non-cancelable operating leases had a weighted average remaining lease term of 4.5 years and a weighted average discount rate of 3.6%.