|**Investment in and Advances to Unconsolidated Affiliates (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|**Equity Method Investments and Joint Ventures [Abstract]**          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Balance Sheet of Equity Method Investments                           | The financial results for our unconsolidated affiliates are summarized below. The summarized income statement information for 2023 and 2022 and summarized balance sheet information as of December 31, 2023 and 2022 includes the following equity investments: MVG and Rivers Des Plaines.December 31,(in millions)20232022AssetsCurrent assets$104.8$91.0Property and equipment, net339.4345.7Other assets, net266.1265.0Total assets$710.3$701.7Liabilities and Members' DeficitCurrent liabilities$106.2$97.9Long-term debt847.2838.6Other liabilities0.70.2Members' deficit(243.8)(235.0)Total liabilities and members' deficit$710.3$701.7
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|                                                                     | December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|(in millions)                                                        | 2023                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Assets                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Current assets                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Property and equipment, net                                          | 339.4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Other assets, net                                                    | 266.1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Total assets                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Liabilities and Members' Deficit                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|Current liabilities                                                  | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Long-term debt                                                       | 847.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Other liabilities                                                    | 0.7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Members' deficit                                                     | (243.8)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Total liabilities and members' deficit                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Income Statement of Equity Method Investments                        | Years Ended December 31,(in millions)202320222021Net revenue$864.8$825.5$740.0Operating and SG&A expense534.0509.1434.2Depreciation and amortization23.825.817.6Operating income307.0290.6288.2Interest and other expense, net(43.9)(24.8)(38.6)Net income$263.1$265.8$249.6                                                                                                                                                                                                                                                                                                                                                                     
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|                                                                     | Years Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|(in millions)                                                        | 2023                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Net revenue                                                          | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Operating and SG&A expense                                           | 534.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Depreciation and amortization                                        | 23.8                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Operating income                                                     | 307.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Interest and other expense, net                                      | (43.9)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Net income                                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                

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