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Restrictive provisions in the entities debt agreements require the entity to maintain the minimum ratio of total rigs owned by the company and its guaranteed subsidiaries to the total rigs owned by the company.

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Other Financial Statement Disclosures - Long Term Debt, Narrative (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Feb. 08, 2017	Jan. 03, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jan. 09, 2017
Debt Instrument [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)							$ 61.6		$ 56.7
Long-term Debt				$ 2,510.7			2,510.7		2,510.3
Current portion of long-term debt				201.1			201.1		0.0
Long-term Debt, Excluding Current Maturities				2,309.6			2,309.6		2,510.3
Letters of credit issued				7.7			7.7
Gain (loss) on extinguishment of debt				0.0	$ (0.5)		$ 0.0	$ 1.7
Subject Notes [Member]
Debt Instrument [Line Items]
Debt instrument, face amount of tender offer			$ 750.0
Early repayment of debt		$ 32.8	490.5
Aggregate amount of debt paid		34.6	463.9
Gain (loss) on extinguishment of debt		2.0	(33.6)
Payment for Debt Extinguishment or Debt Prepayment Cost			5.9
Debt Instrument Redemption Amount as Percentage of Principal							100.00%
Subject Notes [Member] \| 5.85% Senior Notes, due January 2044 [Member]
Debt Instrument [Line Items]
Long-term Debt				396.4			$ 396.4		396.3
Principal amount				400.0			400.0		400.0
Subject Notes [Member] \| 7.875% Senior Notes, due August 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt				201.1			201.1		200.9
Early repayment of debt					7.0
Aggregate amount of debt paid		0.9	186.7		6.5
Gain (loss) on extinguishment of debt					$ (0.5)
Principal amount				201.4			201.4		201.4
Subject Notes [Member] \| 4.875% Senior Notes, due June 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt				624.0			624.0		624.6
Early repayment of debt						$ 33.5
Aggregate amount of debt paid		33.6	9.8			35.8
Gain (loss) on extinguishment of debt						$ 2.4
Principal amount				620.8			620.8		620.8
Subject Notes [Member] \| Senior Note Payable Due September 2017 [Member]
Debt Instrument [Line Items]
Early repayment of debt	$ 94.0
Aggregate amount of debt paid		$ 0.1	265.5
Gain (loss) on extinguishment of debt	$ (2.1)
Principal amount										$ 92.1
Subject Notes [Member] \| 4.75% Senior Notes, due January 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt				396.2			396.2		395.9
Aggregate amount of debt paid			$ 1.9
Principal amount				398.1			398.1		398.1
Subject Notes [Member] \| 7.375% Senior Note Payable Due June 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt				497.8			497.8		497.5
Principal amount				500.0			$ 500.0		500.0
Debt Instrument Redemption Amount as Percentage of Principal							101.00%
Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Covenant Terms							The Existing Credit Facility requires the Company to maintain a total debt-to-capitalization ratio of less than or equal to 60%. The Company's consolidated debt to total capitalization ratio
Line of Credit Facility, Letter of Credit Borrowing Capacity				0.0			$ 0.0
Availability under Revolving Credit Facility				310.7			310.7
Remaining availability under credit facility				310.7			310.7
Amounts outstanding under credit facility				$ 0.0			$ 0.0
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital				33.00%			33.00%
New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Covenant Terms							The New Credit Agreement contains certain financial covenants applicable to the Company and its subsidiaries, including: (i) a covenant restricting debt to total tangible capitalization to not greater than 55% at the end of each fiscal quarter, (ii) a minimum liquidity requirement of $300 million, (iii) a covenant that the ratio of the net book value of the Company's drilling rigs either marketed or under contract with a customer to the sum of commitments under the New Credit Agreement, the commitments under the Existing Credit Agreement plus any other indebtedness of the borrower and guarantors (other than unsecured intercompany indebtedness that is contractually subordinated to the obligations under the New Credit Agreement) that is secured by a lien, guaranteed by, or has an obligor a subsidiary of the Company, in each case, that directly own or operates a drilling rig, is not less than 3:00 to 1:00 at the end of each fiscal quarter (the "Marketed Rig Value Ratio") and (iv) a covenant that the ratio of (A) the net book value of the Company's drilling rigs, subject to certain exclusions that are directly wholly owned by the Company and its subsidiaries who are borrowers and guarantors under the New Credit Facility to (B) the net book value of all drilling rigs owned by the Company and certain of its local content affiliates, is not less than 80% at the end of each fiscal quarter (the "Guaranteed Rig Value Ratio").
Line of Credit Facility, Letter of Credit Borrowing Capacity				$ 50.0			$ 50.0
Availability under Revolving Credit Facility				955.0			955.0
Remaining availability under credit facility				949.6			949.6
Amounts outstanding under credit facility				$ 0.0			$ 0.0
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital				33.00%			33.00%
Line of Credit Facility, Swingline Borrowing Capacity				$ 129.0			$ 129.0
Line of Credit Facility, Restriction				200.0			200.0
Letters of credit issued				5.4			5.4
Line of Credit Facility, Covenant, Liquidity				$ 2,292.7			$ 2,292.7
Line of Credit Facility, Covenant, Marketed Rig Value Ratio				4.14			4.14
Line of Credit Facility, Covenant, Guaranteed Rig Value Ratio				84.00%			84.00%
Matures on January 23 2019 \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Availability under Revolving Credit Facility				$ 60.0			$ 60.0
Matures on January 23, 2020 \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Availability under Revolving Credit Facility				150.7			150.7
Matures on January 23 2021 \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Availability under Revolving Credit Facility				100.0			$ 100.0
Minimum [Member] \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage							0.125%
Minimum [Member] \| New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage							0.375%
Line of Credit Facility, Covenant, Liquidity				$ 300.0			$ 300.0
Line of Credit Facility, Covenant, Marketed Rig Value Ratio				3.00			3.00
Line of Credit Facility, Covenant, Guaranteed Rig Value Ratio				80.00%			80.00%
Maximum [Member] \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage							0.35%
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital				60.00%			60.00%
Maximum [Member] \| New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage							0.70%
Line of Credit Facility, Covenant, Ratio of Indebtedness to Net Capital				55.00%			55.00%
Line of Credit Facility, Additional Borrowing Capacity				$ 250.0			$ 250.0
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							1.125%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							2.75%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							4.25%
Base Rate [Member] \| Minimum [Member] \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							0.125%
Base Rate [Member] \| Minimum [Member] \| New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							1.75%
Base Rate [Member] \| Maximum [Member] \| Existing Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							1.00%
Base Rate [Member] \| Maximum [Member] \| New Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							3.25%
Foreign Tax Authority [Member]
Debt Instrument [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)							$ 33.7		$ 38.3