GUARANTEES OF REGISTERED SECURITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Consolidating Income Statements [Abstract]
REVENUE	$ 824.8	$ 1,282.8	$ 1,843.2
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	682.7	685.0	779.7
Depreciation and amortization	388.9	403.7	402.9
Selling, general and administrative	96.1	104.6	102.2
Gain on sale of assets to unconsolidated subsidiary	(65.8)	(157.4)	0.0
Gain (loss) on disposals of property and equipment	12.1	9.4	8.7
Material Charges And Other Operating Expenses	8.9
Material charges and other operating items	0.0	0.0	32.9
Total costs and expenses	1,122.9	1,045.3	1,326.4
Equity in earnings of unconsolidated subsidiary	10.3	0.9	0.0
INCOME (LOSS) FROM OPERATIONS	(287.8)	238.4	516.8
OTHER INCOME (EXPENSE):
Interest expense	(156.3)	(155.7)	(155.5)
Interest income	33.1	15.4	3.8
Gain on extinguishment of debt	0.0	1.7	(31.2)
Other - net	12.0	(0.5)	(8.3)
Total other (expense) - net	(111.2)	(139.1)	(191.2)
INCOME (LOSS) FROM CONTINUING OPERATIONS
INCOME (LOSS) BEFORE INCOME TAXES	(399.0)	99.3	325.6
Provision (benefit) for income taxes	(51.6)	26.6	5.0
EQUITY IN EARNINGS (LOSSES) OF SUBSIDIARIES, NET OF TAX	0.0	0.0	0.0
NET INCOME (LOSS)	(347.4)	72.7	320.6
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	(347.4)	72.7	320.6
OTHER COMPREHENSIVE LOSS:
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive income, net of income taxes	(17.9)	(33.3)	(5.1)
Net reclassification adjustments for amounts recognized in net income (loss) as a component of net periodic benefit cost, net of income taxes	(5.6)	11.4	7.4
OTHER COMPREHENSIVE INCOME (LOSS)	(23.5)	(21.9)	2.3
COMPREHENSIVE INCOME	(370.9)	50.8	322.9
CURRENT ASSETS:
Cash and cash equivalents	1,332.1	1,255.5	484.2	$ 1,026.7	$ 1,332.1	$ 1,255.5
Receivables - trade and other				251.2	212.8
Prepaid expenses and other current assets				22.4	15.5
Total current assets				1,300.3	1,560.4
Property and equipment - gross				8,652.4	8,833.9
Less accumulated depreciation and amortization				2,451.4	2,281.2
Property and equipment - net				6,201.0	6,552.7
Investment in Consolidated Subsidiary				0.0	0.0
Due from affiliates				0.0	0.0
Long-term note receivable from unconsolidated subsidiary				456.0	270.2	0.0
Investment in unconsolidated subsidiary				41.2	30.9
Other assets				119.2	44.1
TOTAL ASSETS				8,117.7	8,458.3
CURRENT LIABILITIES:
Current portion of long-term debt				201.2	0.0
Accounts payable - trade				122.3	97.2
Deferred revenue				16.7	1.1
Accrued liabilities				113.4	159.1
Total current liabilities				453.6	257.4
Long-term debt, less current portion				2,309.7	2,510.3
Due to affiliates				0.0	0.0
Other liabilities				307.7	293.6
Deferred income taxes - net				11.7	10.9
Shareholders' equity				5,035.0	5,386.1
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY				8,117.7	8,458.3
Consolidated Statement of Cash Flows [Abstract]
Net cash provided by (used in) operations	(160.1)	299.8	929.6
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(169.2)	(100.6)	(117.6)
Deposit on purchase of rigs	0.0	(7.7)	0.0
Purchase of rigs	(70.8)	0.0	0.0
Investment in unconsolidated subsidiary	0.0	(30.0)	0.0
Contributions to unconsolidated subsidiary for note receivable	(271.3)	(357.7)	0.0
Proceeds from sale of assets to unconsolidated subsidiary	266.0	357.7	0.0
Repayments of note receivable from unconsolidated subsidiary	98.5	87.5	0.0
Proceeds from disposals of property and equipment	12.7	3.3	6.2
Origination of Notes Receivable from Related Parties	0.0
Proceeds From (Payments To) Divestiture (Acquisition) Of Interest In Consolidated Subsidiaries	0.0	0.0	0.0
Collections on note receivable from consolidated subsidiary	0.0		0.0
Net cash provided by (used in) investing activities	(134.1)	(47.5)	(111.4)
CASH FLOWS FROM FINANCING ACTIVITIES:
Advances (to) from affiliates	0.0	0.0	0.0
Contributions from parent/issuer	0.0	0.0	0.0
Proceeds from borrowings	0.0	0.0	500.0
Reductions of long-term debt	0.0	(170.0)	(511.8)
Payment of debt extinguishment costs	0.0	0.0	(24.0)
Dividends paid	0.0	0.0	0.0
Debt issue costs	(6.1)	0.0	(8.7)
Proceeds from exercise of share options	0.1	0.0	0.0
Shares repurchased for tax withholdings on vesting of restricted share units	(5.2)	(5.7)	(5.0)
Excess tax benefits from share-based compensation	0.0	0.0	2.6
Net cash provided by (used in) financing activities	(11.2)	(175.7)	(46.9)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(305.4)	76.6	771.3
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,332.1	1,255.5	484.2
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,026.7	1,332.1	1,255.5
Consolidation, Eliminations [Member]
Condensed Consolidating Income Statements [Abstract]
REVENUE	(4.9)	(49.1)	(34.1)
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	0.0	(43.0)	(29.1)
Depreciation and amortization	0.0	0.0	1.0
Selling, general and administrative	(4.9)	(6.1)	(6.0)
Gain on sale of assets to unconsolidated subsidiary	0.0	0.0
Gain (loss) on disposals of property and equipment	0.0	0.0	0.0
Material Charges And Other Operating Expenses	0.0
Material charges and other operating items			0.0
Total costs and expenses	(4.9)	(49.1)	(34.1)
Equity in earnings of unconsolidated subsidiary	0.0	0.0
INCOME (LOSS) FROM OPERATIONS	0.0	0.0	0.0
OTHER INCOME (EXPENSE):
Interest expense	1.9	0.6	4.1
Interest income	(1.9)	(0.6)	(4.1)
Gain on extinguishment of debt		0.0	0.0
Other - net	0.0	0.0	0.0
Total other (expense) - net	0.0	0.0	0.0
INCOME (LOSS) FROM CONTINUING OPERATIONS
INCOME (LOSS) BEFORE INCOME TAXES	0.0	0.0	0.0
Provision (benefit) for income taxes	0.0	0.0	6.6
EQUITY IN EARNINGS (LOSSES) OF SUBSIDIARIES, NET OF TAX	155.0	(290.9)	(335.7)
NET INCOME (LOSS)	155.0	(290.9)	(342.3)
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	155.0	(290.9)	(342.3)
OTHER COMPREHENSIVE LOSS:
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive income, net of income taxes	17.9	33.3	5.1
Net reclassification adjustments for amounts recognized in net income (loss) as a component of net periodic benefit cost, net of income taxes	5.6	(11.4)	(7.4)
OTHER COMPREHENSIVE INCOME (LOSS)	23.5	21.9	(2.3)
COMPREHENSIVE INCOME	178.5	(269.0)	(344.6)
CURRENT ASSETS:
Cash and cash equivalents	0.0	0.0	0.0	0.0	0.0	0.0
Receivables - trade and other				0.0	0.0
Prepaid expenses and other current assets				0.0	0.0
Total current assets				0.0	0.0
Property and equipment - gross				0.0	0.0
Less accumulated depreciation and amortization				0.0	0.0
Property and equipment - net				0.0	0.0
Investment in Consolidated Subsidiary				(6,664.7)	(11,788.2)
Due from affiliates				(5,371.6)	(691.7)
Long-term note receivable from unconsolidated subsidiary				0.0	0.0
Investment in unconsolidated subsidiary				0.0	0.0
Other assets				0.0	0.0
TOTAL ASSETS				(12,036.3)	(12,479.9)
CURRENT LIABILITIES:
Current portion of long-term debt				0.0
Accounts payable - trade				0.0	0.0
Deferred revenue				0.0	0.0
Accrued liabilities				0.0	0.0
Total current liabilities				0.0	0.0
Long-term debt, less current portion				0.0	0.0
Due to affiliates				(5,371.6)	(691.7)
Other liabilities				0.0	0.0
Deferred income taxes - net				0.0	0.0
Shareholders' equity				(6,664.7)	(11,788.2)
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY				(12,036.3)	(12,479.9)
Consolidated Statement of Cash Flows [Abstract]
Net cash provided by (used in) operations	(50.0)	(15.1)	(106.5)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	0.0	0.0	0.0
Deposit on purchase of rigs		0.0
Purchase of rigs	0.0
Investment in unconsolidated subsidiary		0.0
Contributions to unconsolidated subsidiary for note receivable	0.0	0.0
Proceeds from sale of assets to unconsolidated subsidiary	0.0	0.0
Repayments of note receivable from unconsolidated subsidiary	0.0	0.0
Proceeds from disposals of property and equipment	0.0	0.0	0.0
Origination of Notes Receivable from Related Parties	6.9
Proceeds From (Payments To) Divestiture (Acquisition) Of Interest In Consolidated Subsidiaries	5.0	(32.6)	80.8
Collections on note receivable from consolidated subsidiary	(1.9)		(689.7)
Net cash provided by (used in) investing activities	10.0	(32.6)	(608.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Advances (to) from affiliates	0.0	0.0	(3.2)
Contributions from parent/issuer	(5.0)	32.6	(80.8)
Proceeds from borrowings	(6.9)		0.0
Reductions of long-term debt	1.9	0.0	689.7
Payment of debt extinguishment costs			0.0
Dividends paid	50.0	15.1	109.7
Debt issue costs	0.0		0.0
Proceeds from exercise of share options	0.0
Shares repurchased for tax withholdings on vesting of restricted share units	0.0	0.0	0.0
Excess tax benefits from share-based compensation			0.0
Net cash provided by (used in) financing activities	40.0	47.7	715.4
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0.0	0.0	0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0.0	0.0	0.0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0.0	0.0	0.0
Rowan Companies plc (Parent) [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt issue costs			0.0
Excess tax benefits from share-based compensation			0.0
Rowan Companies plc (Parent) [Member] | Reportable Legal Entities [Member]
Condensed Consolidating Income Statements [Abstract]
REVENUE	0.0	0.0	0.0
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	0.0	0.0	0.0
Depreciation and amortization	0.0	0.0	0.0
Selling, general and administrative	25.7	29.2	28.5
Gain on sale of assets to unconsolidated subsidiary	0.0	0.0
Gain (loss) on disposals of property and equipment	0.0	0.0	0.0
Material Charges And Other Operating Expenses	8.9
Material charges and other operating items			0.0
Total costs and expenses	34.6	29.2	28.5
Equity in earnings of unconsolidated subsidiary	0.0	0.0
INCOME (LOSS) FROM OPERATIONS	(34.6)	(29.2)	(28.5)
OTHER INCOME (EXPENSE):
Interest expense	0.0	0.0	0.0
Interest income	0.0	0.0	0.0
Gain on extinguishment of debt		0.0	0.0
Other - net	4.9	20.4	21.2
Total other (expense) - net	4.9	20.4	21.2
INCOME (LOSS) FROM CONTINUING OPERATIONS
INCOME (LOSS) BEFORE INCOME TAXES	(29.7)	(8.8)	(7.3)
Provision (benefit) for income taxes	0.0	0.0	0.0
EQUITY IN EARNINGS (LOSSES) OF SUBSIDIARIES, NET OF TAX	(317.7)	81.5	327.9
NET INCOME (LOSS)	(347.4)	72.7	320.6
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	(347.4)	72.7	320.6
OTHER COMPREHENSIVE LOSS:
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive income, net of income taxes	(17.9)	(33.3)	(5.1)
Net reclassification adjustments for amounts recognized in net income (loss) as a component of net periodic benefit cost, net of income taxes	(5.6)	11.4	7.4
OTHER COMPREHENSIVE INCOME (LOSS)	(23.5)	(21.9)	2.3
COMPREHENSIVE INCOME	(370.9)	50.8	322.9
CURRENT ASSETS:
Cash and cash equivalents	0.2	3.7	17.3	2.5	0.2	3.7
Receivables - trade and other				0.2	0.0
Prepaid expenses and other current assets				0.4	0.3
Total current assets				3.1	0.5
Property and equipment - gross				0.0	0.0
Less accumulated depreciation and amortization				0.0	0.0
Property and equipment - net				0.0	0.0
Investment in Consolidated Subsidiary				5,068.3	5,401.1
Due from affiliates				0.1	0.2
Long-term note receivable from unconsolidated subsidiary				0.0	0.0
Investment in unconsolidated subsidiary				0.0	0.0
Other assets				0.0	0.0
TOTAL ASSETS				5,071.5	5,401.8
CURRENT LIABILITIES:
Current portion of long-term debt				0.0
Accounts payable - trade				4.3	0.7
Deferred revenue				0.0	0.0
Accrued liabilities				1.2	0.0
Total current liabilities				5.5	0.7
Long-term debt, less current portion				0.0	0.0
Due to affiliates				28.7	11.2
Other liabilities				2.3	3.8
Deferred income taxes - net				0.0	0.0
Shareholders' equity				5,035.0	5,386.1
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY				5,071.5	5,401.8
Consolidated Statement of Cash Flows [Abstract]
Net cash provided by (used in) operations	(11.6)	(10.0)	(6.4)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	0.0	0.0	0.0
Deposit on purchase of rigs		0.0
Purchase of rigs	0.0
Investment in unconsolidated subsidiary		0.0
Contributions to unconsolidated subsidiary for note receivable	0.0	0.0
Proceeds from sale of assets to unconsolidated subsidiary	0.0	0.0
Repayments of note receivable from unconsolidated subsidiary	0.0	0.0
Proceeds from disposals of property and equipment	0.0	0.0	0.0
Origination of Notes Receivable from Related Parties	0.0
Proceeds From (Payments To) Divestiture (Acquisition) Of Interest In Consolidated Subsidiaries	0.0	0.0	(0.2)
Collections on note receivable from consolidated subsidiary	0.0		0.0
Net cash provided by (used in) investing activities	0.0	0.0	(0.2)
CASH FLOWS FROM FINANCING ACTIVITIES:
Advances (to) from affiliates	14.0	12.2	(2.0)
Contributions from parent/issuer	0.0	0.0	0.0
Proceeds from borrowings	5.0		0.0
Reductions of long-term debt	0.0	0.0	0.0
Payment of debt extinguishment costs			0.0
Dividends paid	0.0	0.0	0.0
Debt issue costs	0.0
Proceeds from exercise of share options	0.1
Shares repurchased for tax withholdings on vesting of restricted share units	(5.2)	(5.7)	(5.0)
Net cash provided by (used in) financing activities	13.9	6.5	(7.0)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2.3	(3.5)	(13.6)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0.2	3.7	17.3
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 2.5	0.2	3.7
RCI (Issuer) [Member]
Condensed Financial Statements, Captions [Line Items]
Subsidiary ownership percentage by parent	100.00%
RCI (Issuer) [Member] | Reportable Legal Entities [Member]
Condensed Consolidating Income Statements [Abstract]
REVENUE	$ 4.9	48.7	40.4
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	0.0	0.5	12.4
Depreciation and amortization	0.0	18.3	19.2
Selling, general and administrative	0.6	0.2	5.5
Gain on sale of assets to unconsolidated subsidiary	0.0	0.0
Gain (loss) on disposals of property and equipment	3.7	1.7	0.9
Material Charges And Other Operating Expenses	0.0
Material charges and other operating items			0.0
Total costs and expenses	4.3	20.7	38.0
Equity in earnings of unconsolidated subsidiary	0.0	0.0
INCOME (LOSS) FROM OPERATIONS	0.6	28.0	2.4
OTHER INCOME (EXPENSE):
Interest expense	(151.0)	(155.8)	(155.5)
Interest income	3.7	3.6	5.1
Gain on extinguishment of debt		1.7	(31.2)
Other - net	(1.7)	(20.7)	(20.9)
Total other (expense) - net	(149.0)	(171.2)	(202.5)
INCOME (LOSS) FROM CONTINUING OPERATIONS
INCOME (LOSS) BEFORE INCOME TAXES	(148.4)	(143.2)	(200.1)
Provision (benefit) for income taxes	(87.6)	(8.2)	5.1
EQUITY IN EARNINGS (LOSSES) OF SUBSIDIARIES, NET OF TAX	162.7	209.4	7.8
NET INCOME (LOSS)	101.9	74.4	(197.4)
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	101.9	74.4	(197.4)
OTHER COMPREHENSIVE LOSS:
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive income, net of income taxes	(17.9)	(33.3)	(5.1)
Net reclassification adjustments for amounts recognized in net income (loss) as a component of net periodic benefit cost, net of income taxes	(5.6)	11.4	7.4
OTHER COMPREHENSIVE INCOME (LOSS)	(23.5)	(21.9)	2.3
COMPREHENSIVE INCOME	78.4	52.5	(195.1)
CURRENT ASSETS:
Cash and cash equivalents	206.3	532.0	9.5	324.6	206.3	532.0
Receivables - trade and other				2.6	1.2
Prepaid expenses and other current assets				8.3	10.7
Total current assets				335.5	218.2
Property and equipment - gross				247.3	241.9
Less accumulated depreciation and amortization				138.0	121.4
Property and equipment - net				109.3	120.5
Investment in Consolidated Subsidiary				1,596.4	6,387.1
Due from affiliates				5,357.4	680.0
Long-term note receivable from unconsolidated subsidiary				0.0	0.0
Investment in unconsolidated subsidiary				0.0	0.0
Other assets				109.6	36.4
TOTAL ASSETS				7,508.2	7,442.2
CURRENT LIABILITIES:
Current portion of long-term debt				201.2
Accounts payable - trade				10.2	12.9
Deferred revenue				0.0	0.0
Accrued liabilities				76.5	95.7
Total current liabilities				287.9	108.6
Long-term debt, less current portion				2,309.7	2,510.3
Due to affiliates				8.6	11.4
Other liabilities				264.3	261.2
Deferred income taxes - net				0.0	0.0
Shareholders' equity				4,637.7	4,550.7
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY				7,508.2	7,442.2
Consolidated Statement of Cash Flows [Abstract]
Net cash provided by (used in) operations	(139.6)	(11.3)	(58.8)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(12.1)	(18.3)	(44.5)
Deposit on purchase of rigs		0.0
Purchase of rigs	0.0
Investment in unconsolidated subsidiary		0.0
Contributions to unconsolidated subsidiary for note receivable	0.0	0.0
Proceeds from sale of assets to unconsolidated subsidiary	0.0	0.0
Repayments of note receivable from unconsolidated subsidiary	0.0	0.0
Proceeds from disposals of property and equipment	1.4	1.0	0.4
Origination of Notes Receivable from Related Parties	(6.9)
Proceeds From (Payments To) Divestiture (Acquisition) Of Interest In Consolidated Subsidiaries	(5.0)	32.6	(80.6)
Collections on note receivable from consolidated subsidiary	1.9		689.7
Net cash provided by (used in) investing activities	(20.7)	15.3	565.0
CASH FLOWS FROM FINANCING ACTIVITIES:
Advances (to) from affiliates	278.6	(159.7)	58.2
Contributions from parent/issuer	0.0	0.0	0.0
Proceeds from borrowings	0.0		500.0
Reductions of long-term debt	0.0	(170.0)	(511.8)
Payment of debt extinguishment costs			(24.0)
Dividends paid	0.0	0.0	0.0
Debt issue costs	0.0		(8.7)
Proceeds from exercise of share options	0.0
Shares repurchased for tax withholdings on vesting of restricted share units	0.0	0.0	0.0
Excess tax benefits from share-based compensation			2.6
Net cash provided by (used in) financing activities	278.6	(329.7)	16.3
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	118.3	(325.7)	522.5
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	206.3	532.0	9.5
CASH AND CASH EQUIVALENTS, END OF PERIOD	324.6	206.3	532.0
Other non-guarantor subsidiaries [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt issue costs			0.0
Excess tax benefits from share-based compensation			0.0
Other non-guarantor subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Consolidating Income Statements [Abstract]
REVENUE	824.8	1,283.2	1,836.9
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	682.7	727.5	796.4
Depreciation and amortization	388.9	385.4	382.7
Selling, general and administrative	74.7	81.3	74.2
Gain on sale of assets to unconsolidated subsidiary	(65.8)	(157.4)
Gain (loss) on disposals of property and equipment	8.4	7.7	7.8
Material Charges And Other Operating Expenses	0.0
Material charges and other operating items			32.9
Total costs and expenses	1,088.9	1,044.5	1,294.0
Equity in earnings of unconsolidated subsidiary	10.3	0.9
INCOME (LOSS) FROM OPERATIONS	(253.8)	239.6	542.9
OTHER INCOME (EXPENSE):
Interest expense	(7.2)	(0.5)	(4.1)
Interest income	31.3	12.4	2.8
Gain on extinguishment of debt		0.0	0.0
Other - net	8.8	(0.2)	(8.6)
Total other (expense) - net	32.9	11.7	(9.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS
INCOME (LOSS) BEFORE INCOME TAXES	(220.9)	251.3	533.0
Provision (benefit) for income taxes	36.0	34.8	(6.7)
EQUITY IN EARNINGS (LOSSES) OF SUBSIDIARIES, NET OF TAX	0.0	0.0	0.0
NET INCOME (LOSS)	(256.9)	216.5	539.7
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	(256.9)	216.5	539.7
OTHER COMPREHENSIVE LOSS:
Net changes in pension and other postretirement plan assets and benefit obligations recognized in other comprehensive income, net of income taxes	0.0	0.0	0.0
Net reclassification adjustments for amounts recognized in net income (loss) as a component of net periodic benefit cost, net of income taxes	0.0	0.0	0.0
OTHER COMPREHENSIVE INCOME (LOSS)	0.0	0.0	0.0
COMPREHENSIVE INCOME	(256.9)	216.5	539.7
CURRENT ASSETS:
Cash and cash equivalents	1,125.6	719.8	457.4	699.6	1,125.6	$ 719.8
Receivables - trade and other				248.4	211.6
Prepaid expenses and other current assets				13.7	4.5
Total current assets				961.7	1,341.7
Property and equipment - gross				8,405.1	8,592.0
Less accumulated depreciation and amortization				2,313.4	2,159.8
Property and equipment - net				6,091.7	6,432.2
Investment in Consolidated Subsidiary				0.0	0.0
Due from affiliates				14.1	11.5
Long-term note receivable from unconsolidated subsidiary				456.0	270.2
Investment in unconsolidated subsidiary				41.2	30.9
Other assets				9.6	7.7
TOTAL ASSETS				7,574.3	8,094.2
CURRENT LIABILITIES:
Current portion of long-term debt				0.0
Accounts payable - trade				107.8	83.6
Deferred revenue				16.7	1.1
Accrued liabilities				35.7	63.4
Total current liabilities				160.2	148.1
Long-term debt, less current portion				0.0	0.0
Due to affiliates				5,334.3	669.1
Other liabilities				41.1	28.6
Deferred income taxes - net				11.7	10.9
Shareholders' equity				2,027.0	7,237.5
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY				$ 7,574.3	$ 8,094.2
Consolidated Statement of Cash Flows [Abstract]
Net cash provided by (used in) operations	41.1	336.2	1,101.3
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(157.1)	(82.3)	(73.1)
Deposit on purchase of rigs		(7.7)
Purchase of rigs	(70.8)
Investment in unconsolidated subsidiary		(30.0)
Contributions to unconsolidated subsidiary for note receivable	(271.3)	(357.7)
Proceeds from sale of assets to unconsolidated subsidiary	266.0	357.7
Repayments of note receivable from unconsolidated subsidiary	98.5	87.5
Proceeds from disposals of property and equipment	11.3	2.3	5.8
Origination of Notes Receivable from Related Parties	0.0
Proceeds From (Payments To) Divestiture (Acquisition) Of Interest In Consolidated Subsidiaries	0.0	0.0	0.0
Collections on note receivable from consolidated subsidiary	0.0		0.0
Net cash provided by (used in) investing activities	(123.4)	(30.2)	(67.3)
CASH FLOWS FROM FINANCING ACTIVITIES:
Advances (to) from affiliates	(292.6)	147.5	(53.0)
Contributions from parent/issuer	5.0	(32.6)	80.8
Proceeds from borrowings	1.9		0.0
Reductions of long-term debt	(1.9)	0.0	(689.7)
Payment of debt extinguishment costs			0.0
Dividends paid	(50.0)	(15.1)	(109.7)
Debt issue costs	(6.1)
Proceeds from exercise of share options	0.0
Shares repurchased for tax withholdings on vesting of restricted share units	0.0	0.0	0.0
Net cash provided by (used in) financing activities	(343.7)	99.8	(771.6)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(426.0)	405.8	262.4
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,125.6	719.8	457.4
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 699.6	$ 1,125.6	$ 719.8