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Debt - $1,450 Senior Secured Credit Facility (Details) - USD ($)
12 Months Ended
Mar. 20, 2013
Dec. 31, 2015
Apr. 28, 2016
Mar. 31, 2016
Dec. 31, 2014
Nov. 04, 2014
Jun. 26, 2014
Mar. 31, 2014
Debt Instrument [Line Items]                
Debt outstanding   $ 3,592,300,000     $ 3,303,900,000      
$1450 facility                
Debt Instrument [Line Items]                
Debt outstanding   $ 775,600,000            
$1450 facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Interest rate added to LIBOR 7.50%              
Guarantee fee 1.50%              
Notes Payable to Banks                
Debt Instrument [Line Items]                
Debt instrument, covenant compliance, minimum market value of rigs to loan outstanding   135.00%            
Line of Credit | $1450 facility                
Debt Instrument [Line Items]                
Debt outstanding   $ 382,600,000     422,900,000      
Revolving Credit Facility                
Debt Instrument [Line Items]                
Assets pledged as collateral   3,800,000,000            
Revolving Credit Facility | $1450 facility                
Debt Instrument [Line Items]                
Long-term line of credit           $ 433,000,000   $ 443,000,000
Maximum borrowing capacity $ 1,450,000,000 $ 1,450,000,000     $ 1,450,000,000      
Variable rate basis on debt issuance   LIBOR            
Balloon payment to be paid             $ 86,000,000  
Period remaining until refinancing 5 years              
Assets pledged as collateral   $ 734,800,000            
Facility subject to guarantee benefits           $ 307.4    
Minimum | $1450 facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Interest rate added to LIBOR 1.20%              
Maximum | $1450 facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Interest rate added to LIBOR 3.00%              
West Vela | Notes Payable to Banks                
Debt Instrument [Line Items]                
Debt instrument, covenant compliance, minimum market value of rigs to loan outstanding   125.00%            
Subsequent Event | Revolving Credit Facility | $1450 facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 1,450,000,000          
Subsequent Event | West Vela | Notes Payable to Banks                
Debt Instrument [Line Items]                
Debt instrument, covenant compliance, minimum market value of rigs to loan outstanding       140.00%