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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.