|**Investment in and Advances to Unconsolidated Affiliates (Tables)** | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                     
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|**Investments in and Advances to Affiliates [Abstract]**             |                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Affiliate Income Statement                                           | Summarized below are the financial results for our unconsolidated affiliates.Three Months Ended June 30,Six Months Ended June 30,(in millions)2022202120222021Net revenue$214.6$197.9$391.8$336.6Operating and SG&A expense130.7109.8248.9195.4Depreciation and amortization6.34.411.68.7Total operating expense137.0114.2260.5204.1Operating income77.683.7131.3132.5Interest and other, net(7.3)(19.7)(3.2)(24.3)Net income$70.3$64.0$128.1$108.2
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|                                                                     | Three Months Ended June 30,                                                                                                                                                                                                                                                                                                                                                                                                                        
|(in millions)                                                        | 2022                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Net revenue                                                          | $                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|Operating and SG&A expense                                           | 130.7                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Depreciation and amortization                                        | 6.3                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Total operating expense                                              | 137.0                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Operating income                                                     | 77.6                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Interest and other, net                                              | (7.3)                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Net income                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Affiliate Balance Sheet                                              | (in millions)June 30, 2022December 31, 2021AssetsCurrent assets$88.4$96.0Property and equipment, net349.0312.3Other assets, net263.6264.1Total assets$701.0$672.4Liabilities and Members' DeficitCurrent liabilities$109.8$95.3Long-term debt827.8786.9Other liabilities—20.6Members' deficit(236.6)(230.4)Total liabilities and members' deficit$701.0$672.4                                                                                      
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|(in millions)                                                        | June 30, 2022                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Assets                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Current assets                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Property and equipment, net                                          | 349.0                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Other assets, net                                                    | 263.6                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Total assets                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Liabilities and Members' Deficit                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Current liabilities                                                  | $                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Long-term debt                                                       | 827.8                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Other liabilities                                                    | —                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Members' deficit                                                     | (236.6)                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total liabilities and members' deficit                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                  

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