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Investments - Summarized Financial Information, BKFC (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]          
Depreciation and amortization $ 2.4 $ 3.0 $ 5.0 $ 6.1  
Interest expense 1.2 3.3 3.5 7.1  
Operating loss (56.8) (60.9) (78.9) (82.3)  
Losses of unconsolidated affiliates (9.1) (1.7) (12.8) (3.7)  
Net income (loss) attributable to BKFC 28.4 (240.5) (7.4) (355.5) $ (536.7)
BKFC          
Schedule of Equity Method Investments [Line Items]          
Total revenues 88.7 61.2 166.7 132.5  
Depreciation and amortization 47.7 28.0 79.1 55.2  
Interest expense 8.5 5.8 16.0 10.1  
Operating loss (20.7) (23.7) (35.9) (36.8)  
Losses of unconsolidated affiliates 0.0 2.3 (3.6) (3.1)  
Net income (loss) attributable to BKFC $ 23.8 $ (26.1) $ 6.1 $ (47.5)