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Investments in Affiliates - Schedule of Financial Information for Equity Method Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement        
Revenues $ 52.5 $ 49.4 $ 156.0 $ 159.7
Operating costs and expenses 35.5 38.8 109.7 119.7
Income (loss) from continuing operations 12.0 5.8 32.3 2.8
Net income (loss) 14.6 6.4 33.3 21.0
Equity Method Investments        
Income Statement        
Revenues 41.4 37.0 120.0 97.8
Operating costs and expenses 36.1 31.8 106.2 89.5
Gross Profit (Loss) 5.3 5.2 13.8 8.3
Income (loss) from continuing operations 1.1 2.0 0.3 (2.7)
Net income (loss) $ 1.1 $ 2.3 $ 0.3 $ 2.9