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Equity Method Investments - Summarized Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Total current assets $ 176.2 $ 140.8    
Total non-current assets 2,904.1 3,030.3    
Total assets 3,080.3 3,171.1 $ 3,280.0  
Total current liabilities 117.9 96.0    
Total non-current liabilities 2,072.5 2,038.3    
Equity 889.9 1,036.8 $ 1,294.1 $ 1,533.5
Total liabilities and equity 3,080.3 3,171.1    
Perfomex        
Schedule of Equity Method Investments [Line Items]        
Cash 9.0 0.8    
Total current assets 142.2 152.6    
Total non-current assets 4.2 1.8    
Total assets 146.4 154.4    
Total current liabilities 132.1 140.4    
Total non-current liabilities 0.0 0.7    
Equity 14.3 13.3    
Total liabilities and equity 146.4 154.4    
Perfomex II        
Schedule of Equity Method Investments [Line Items]        
Cash 7.2 0.4    
Total current assets 48.7 41.1    
Total non-current assets 2.1 1.7    
Total assets 50.8 42.8    
Total current liabilities 45.8 42.8    
Total non-current liabilities 0.0 0.0    
Equity 5.0 0.0    
Total liabilities and equity $ 50.8 42.8    
Opex        
Schedule of Equity Method Investments [Line Items]        
Cash   0.2    
Total current assets   220.0    
Total non-current assets   0.0    
Total assets   220.0    
Total current liabilities   207.8    
Total non-current liabilities   21.3    
Equity   (9.1)    
Total liabilities and equity   220.0    
Akal        
Schedule of Equity Method Investments [Line Items]        
Cash   3.7    
Total current assets   116.5    
Total non-current assets   0.0    
Total assets   116.5    
Total current liabilities   117.6    
Total non-current liabilities   2.3    
Equity   (3.4)    
Total liabilities and equity   $ 116.5