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Investments in Affiliates - Summary of Financial Information for Equity Method Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet      
Total assets $ 2,036.0 $ 2,084.3 $ 2,225.2
Total liabilities 933.4 949.3  
Income Statement      
Revenue 305.3 435.2 644.4
Operating costs and expenses 285.2 449.5 523.0
Income (loss) from Continuing Operations 5.6 (38.9) (52.9)
Net income (loss) 5.6 (36.4) (72.0)
Equity Method Investments      
Balance Sheet      
Current assets 73.0 79.3  
Non-current assets 688.0 697.9  
Total assets 761.0 777.2  
Current liabilities 33.5 27.1  
Non-current liabilities 96.7 109.0  
Total liabilities 130.2 136.1  
Income Statement      
Revenue 174.2 191.9 243.6
Operating costs and expenses 147.1 173.0 209.7
Gross profit (loss) 27.1 18.9 33.9
Income (loss) from Continuing Operations 12.1 6.6 17.4
Net income (loss) $ 11.6 $ 6.6 $ 16.5