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Variable Interest Entities - Carrying Amounts and Classification of Consolidated VIEs (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Current assets: |  |  |  |  |
Cash and cash equivalents |  | $ 69.1 | $ 21.8 | $ 49.4 | $ 185.6
Accounts receivable |  | 611.6 | 536.8 |  |
Other current assets |  | 91.5 | 92.1 |  |
Total current assets |  | 841.8 | 717.2 |  |
Property and equipment, net |  | 3,301.0 | 2,939.2 |  |
Operating lease right-of-use assets |  | 208.5 | 212.5 |  |
Goodwill |  | 1,281.3 | 1,263.2 | $ 1,237.0 | $ 1,228.2
Intangible assets, net |  | 278.2 | 282.3 |  |
Other long-term assets |  | 191.6 | 222.1 |  |
Total assets | [1] | 6,102.4 | 5,636.5 |  |
Current liabilities: |  |  |  |  |
Current portion of long-term debt |  | 24.8 | 25.2 |  |
Current operating lease liabilities |  | 24.1 | 25.6 |  |
Accounts payable |  | 170.0 | 132.9 |  |
Accrued payroll |  | 207.5 | 168.3 |  |
Other current liabilities |  | 187.4 | 181.1 |  |
Total current liabilities |  | 656.4 | 575.9 |  |
Long-term debt, net of current portion |  | 2,687.8 | 2,741.8 |  |
Long-term operating lease liabilities |  | 196.1 | 199.7 |  |
Total liabilities | [1] | 3,805.2 | 3,774.6 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Current assets: |  |  |  |  |
Cash and cash equivalents |  | 0.2 | 0.2 |  |
Accounts receivable |  | 36.7 | 34.0 |  |
Other current assets |  | 5.0 | 6.7 |  |
Total current assets |  | 41.9 | 40.9 |  |
Property and equipment, net |  | 128.8 | 129.0 |  |
Operating lease right-of-use assets |  | 1.4 | 1.7 |  |
Goodwill |  | 15.9 | 15.9 |  |
Intangible assets, net |  | 1.2 | 1.5 |  |
Other long-term assets |  | 18.5 | 18.8 |  |
Total assets |  | 207.7 | 207.8 |  |
Current liabilities: |  |  |  |  |
Current portion of long-term debt |  | 0.9 | 0.8 |  |
Current operating lease liabilities |  | 0.0 | 0.4 |  |
Accounts payable |  | 7.6 | 7.0 |  |
Accrued payroll |  | 9.4 | 8.2 |  |
Other current liabilities |  | 9.3 | 15.7 |  |
Total current liabilities |  | 27.2 | 32.1 |  |
Long-term debt, net of current portion |  | 13.6 | 14.5 |  |
Long-term operating lease liabilities |  | 1.4 | 1.3 |  |
Total liabilities |  | $ 42.2 | $ 47.9 |  |
[1] | Our consolidated assets as of December 31, 2023 and December 31, 2022 include total assets of variable interest entities of $207.7 million and $207.8 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2023 and December 31, 2022 include total liabilities of the variable interest entities of $42.2 million and $47.9 million, respectively. See Note 4, Variable Interest Entities.

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