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Acquisition of Atwood Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 06, 2017
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Liabilities:        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets   $ 8.3 $ 8.3  
Payments For Business Acquisition, Acquired Entity Liabilities $ (1,305.9)      
Bargain purchase gain 148.5   8.3 $ 0.0
Atwood        
Assets:        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 445.4      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash And Cash Equivalents     0.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 60.7      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable     (1.6)  
Other current assets 122.8      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets     4.7  
Property and equipment 1,771.2      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment     9.2  
Other assets 20.8      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets     (2.9)  
Liabilities:        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 62.6      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Liabilities     (2.3)  
Other liabilities 122.1      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities     $ 3.4  
Net assets acquired 2,236.2      
Repayment of Atwood debt (781.8)      
Scenario, Previously Reported [Member]        
Liabilities:        
Payments For Business Acquisition, Acquired Entity Liabilities (1,305.9)      
Bargain purchase gain 140.2      
Scenario, Previously Reported [Member] | Atwood        
Assets:        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 445.4      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 62.3      
Other current assets 118.1      
Property and equipment 1,762.0      
Other assets 23.7      
Liabilities:        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 64.9      
Other liabilities 118.7      
Net assets acquired 2,227.9      
Repayment of Atwood debt $ (781.8)