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Debt (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Feb. 28, 2018	Feb. 09, 2018
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 721,800,000
Common Stock, Dividends, Per Share, Cash Paid	$ 0.01	$ 0.01
7.75% senior notes due 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.75%
8.50% senior notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.50%		8.50%
Debt Instrument, Repurchased Face Amount	$ 237,600,000
6.875% senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%		6.875%
Debt Instrument, Repurchased Face Amount	$ 328,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 122,900,000
4.70% senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Debt Instrument, Repurchased Face Amount	$ 156,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	113,500,000
Five year credit facility | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 2,000,000,000		$ 2,000,000,000
Potential_Additional_Revolver_Capacity			1,500,000,000
Line of Credit Facility, Commitment Fee Percentage	0.75%
Maximum Percent of Debt to Total Capitalization Ratio	60.00%
Debt Covenant, Additional Secured Debt, Value			750,000,000
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0		$ 0
Debt Covenant, Additional Secured Debt, Percent Of Tangible Net Worth			10.00%
Common Stock, Dividends, Per Share, Cash Paid			$ 0.01
Debt Covenant, Aggregate Amount Of Available Cash			$ 150,000,000
Five year credit facility | Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
Five year credit facility | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	4.00%
Credit Facility maturing in 2020 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity			1,300,000,000
Credit Facility due 2022 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 1,200,000,000
Debt Covenant, Period For Repayment Of Acquired Companies			90 days
Debt Covenant, Aggregate Amount Of Available Cash, After Repayments			$ 250,000,000
Senior Notes [Member] | 7.75% senior notes due 2026
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.75%
Senior Notes [Member] | 8.50% senior notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.50%
Debt Instrument, Repurchased Face Amount				$ 55,000,000	$ 182,600,000
Senior Notes [Member] | 6.875% senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.875%
Debt Instrument, Repurchased Face Amount				$ 71,400,000	$ 256,600,000
Senior Notes [Member] | 4.70% senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.70%
Debt Instrument, Repurchased Face Amount	$ 156,200,000

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Potential additional revolver capacity if committements are received from new or existing syndicate lenders.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Face (par) amount of the original debt instrument that was repurchased.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Fair value of the amount outstanding under the credit facility.

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