LONG-TERM DEBT (Details) - USD ($)				1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Feb. 08, 2017	Jan. 03, 2017	Dec. 19, 2016	Jul. 31, 2017	Jan. 31, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 09, 2017
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 2,510,900,000	$ 2,510,300,000
Current portion of long-term debt									201,200,000	0
Long-term debt									2,309,700,000	2,510,300,000
Line of Credit Facility [Abstract]
Letters of credit outstanding									9,100,000
Debt Reductions [Abstract]
(Gain) loss on extinguishment of debt									0	(1,700,000)	$ 31,200,000
Proceeds from borrowings									0	0	500,000,000
Long-term debt, principal amount									$ 2,520,300,000
RCI [Member]
Debt Reductions [Abstract]
Subsidiary ownership percentage by parent			100.00%
Senior Notes [Member]
Debt Reductions [Abstract]
Cash payment to retire long-term debt					$ 32,800,000	$ 490,500,000
Aggregate principal amount extinguished					34,600,000	463,900,000
(Gain) loss on extinguishment of debt		$ (2,000,000)	$ 33,600,000			33,600,000
Debt instrument, face amount of tender offer						750,000,000					$ 750,000,000
Debt extinguishment costs						5,900,000
Debt extinguishment costs, expensed			5,300,000
Redemption amount as percentage of principal									100.00%
Senior Notes [Member] | Senior Note Payable Due 2017 and 2019 [Member]
Debt Reductions [Abstract]
Cash payment to retire long-term debt								$ 45,200,000
Aggregate principal amount extinguished								47,900,000
(Gain) loss on extinguishment of debt								$ (2,400,000)
Senior Notes [Member] | 7.875 % Senior Notes, due August 2019 [Member]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 201,200,000	200,900,000
Line of Credit Facility [Abstract]
Effective interest rate									8.00%
Stated interest rate									7.875%
Debt Reductions [Abstract]
Cash payment to retire long-term debt				$ 7,000,000
Aggregate principal amount extinguished				6,500,000	900,000	186,700,000
(Gain) loss on extinguishment of debt				$ 500,000
Long-term debt, principal amount									$ 201,400,000	201,400,000
Senior Notes [Member] | 4.875% Senior Notes, due June 2022 [Member]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 623,800,000	624,600,000
Line of Credit Facility [Abstract]
Effective interest rate									4.70%
Stated interest rate									4.875%
Debt Reductions [Abstract]
Cash payment to retire long-term debt							$ 33,500,000
Aggregate principal amount extinguished					33,600,000	9,800,000	35,800,000
(Gain) loss on extinguishment of debt							$ (2,400,000)
Long-term debt, principal amount									$ 620,800,000	620,800,000
Senior Notes [Member] | Senior Note Payable Due September 2017 [Member]
Debt Reductions [Abstract]
Cash payment to retire long-term debt	$ 94,000,000
Aggregate principal amount extinguished					$ 100,000	265,500,000
(Gain) loss on extinguishment of debt	$ 2,100,000
Long-term debt, principal amount												$ 92,100,000
Senior Notes [Member] | 4.75% Senior Notes, due January 2024 [Member]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 396,300,000	395,900,000
Line of Credit Facility [Abstract]
Effective interest rate									4.80%
Stated interest rate									4.75%
Debt Reductions [Abstract]
Aggregate principal amount extinguished						$ 1,900,000
Long-term debt, principal amount									$ 398,100,000	398,100,000
Senior Notes [Member] | 7.375% Senior Notes, due June 2025 [Member]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 497,800,000	497,500,000
Line of Credit Facility [Abstract]
Effective interest rate									7.40%
Stated interest rate									7.375%
Debt Reductions [Abstract]
Proceeds from borrowings			$ 492,000,000
Issue amount as percentage of principal			100.00%
Redemption amount as percentage of principal									101.00%
Long-term debt, principal amount			$ 500,000,000						$ 500,000,000	500,000,000
Senior Notes [Member] | 5.4% Senior Notes due December 2042 [Member]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 395,300,000	395,100,000
Line of Credit Facility [Abstract]
Effective interest rate									5.40%
Stated interest rate									5.40%
Debt Reductions [Abstract]
Long-term debt, principal amount									$ 400,000,000	400,000,000
Senior Notes [Member] | 5.85% Senior Notes, due January 2044 [Member]
Long-term Debt, Current and Noncurrent [Abstract]
Long-term debt, carrying value									$ 396,500,000	396,300,000
Line of Credit Facility [Abstract]
Effective interest rate									5.90%
Stated interest rate									5.85%
Debt Reductions [Abstract]
Long-term debt, principal amount									$ 400,000,000	$ 400,000,000
New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of Credit Facility, Letter of Credit Borrowing Capacity									50,000,000
Borrowing capacity under the revolving credit facility									955,000,000
Line of Credit Facility, Remaining Borrowing Capacity									948,200,000
Revolving credit facility, amount drawn									0
Letters of credit outstanding									6,800,000
Line of Credit Facility, Swingline Borrowing Capacity									129,000,000
Line of Credit Facility, Restriction									$ 200,000,000
Financial Covenant [Abstract]
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital									33.00%
Line of Credit Facility, Covenant, Liquidity									$ 2,285,600,000
Line of Credit Facility, Covenant, Marketed Rig Value Ratio									4.1
Line of Credit Facility, Covenant, Guaranteed Rig Value Ratio									86.00%
Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Line of Credit Facility, Letter of Credit Borrowing Capacity									$ 0
Borrowing capacity under the revolving credit facility									310,700,000
Line of Credit Facility, Remaining Borrowing Capacity									310,700,000
Revolving credit facility, amount drawn									$ 0
Financial Covenant [Abstract]
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital									33.00%
Existing Revolving Credit Facility [Member] | Matures on January 23, 2019 [Member]
Line of Credit Facility [Abstract]
Borrowing capacity under the revolving credit facility									$ 60,000,000
Existing Revolving Credit Facility [Member] | Matures on January 23, 2020 [Member]
Line of Credit Facility [Abstract]
Borrowing capacity under the revolving credit facility									150,700,000
Existing Revolving Credit Facility [Member] | Matures on January 23, 2021 [Member]
Line of Credit Facility [Abstract]
Borrowing capacity under the revolving credit facility									$ 100,000,000
Minimum [Member] | New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee percentage									0.375%
Financial Covenant [Abstract]
Line of Credit Facility, Covenant, Liquidity									$ 300,000,000
Line of Credit Facility, Covenant, Marketed Rig Value Ratio									3.00
Line of Credit Facility, Covenant, Guaranteed Rig Value Ratio									80.00%
Minimum [Member] | Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee percentage									0.125%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									2.75%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									1.125%
Minimum [Member] | Base Rate [Member] | New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									1.75%
Minimum [Member] | Base Rate [Member] | Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									0.125%
Maximum [Member] | New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee percentage									0.70%
Line of Credit Facility, Additional Borrowing Capacity									$ 250,000,000
Financial Covenant [Abstract]
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital									55.00%
Maximum [Member] | Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, commitment fee percentage									0.35%
Financial Covenant [Abstract]
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital									60.00%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									4.25%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									2.00%
Maximum [Member] | Base Rate [Member] | New Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									3.25%
Maximum [Member] | Base Rate [Member] | Existing Revolving Credit Facility [Member]
Line of Credit Facility [Abstract]
Revolving credit facility, basis spread on variable rate									1.00%