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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
REVENUE $ 176.5 $ 211.2      
Deferred Costs [Abstract]          
Contract assets       $ 8.9 $ 9.1
Contract Liabilities [Abstract]          
Contract liabilities, current       11.3 16.7
Contract liabilities 35.8   $ 29.0 29.0 35.8
Movement in Deferred costs [Rollforward]          
Beginning balance 3.6   0.9    
Less: amortization 2.7        
Ending balance 0.9        
Demobilization Revenue [Roll Forward]          
Beginning balance 5.5   8.0    
Plus: contractual additions 2.5        
Ending balance 8.0        
Movement in Deferred Revenue [Roll Forward]          
Beginning balance 35.8   29.0    
Plus: contractual additions 2.4        
Less: amortization 9.2        
Ending balance (1) 29.0        
Capex [Member]          
Movement in Deferred Revenue [Roll Forward]          
Plus: contractual additions 14.3        
Deferred Revenue [Member]          
Contract Liabilities [Abstract]          
Contract liabilities, current       11.3 16.7
Prepaid Expenses and Other Current Assets [Member]          
Deferred Costs [Abstract]          
Contract assets, current       8.6 8.7
Other Noncurrent Liabilities [Member]          
Contract Liabilities [Abstract]          
Contract liabilities, noncurrent       17.7 19.1
Other Assets [Member]          
Deferred Costs [Abstract]          
Contract assets, non-current       $ 0.3 $ 0.4
Accounts Receivable [Member]          
Movement in Deferred Revenue [Roll Forward]          
Plus: contractual additions $ 14.3        
Scenario, Forecast [Member] | Demobilization [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
REVENUE     $ 3.4