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Debt Schedule of Extinguishment of Debt - Tender Offers and Repurchases (Details) - USD ($) $ in Millions	Jun. 30, 2018	Feb. 28, 2018	Feb. 09, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Aggregate Principal Amount Repurchased	$ 721.8
Aggregate Repurchase Price	$ 771.2
8.50% senior notes due 2019
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.50%
Aggregate Principal Amount Repurchased	$ 237.6
Aggregate Repurchase Price	$ 256.8
6.875% Senior notes due 2020(2)
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.875%			6.875%
Aggregate Principal Amount Repurchased	$ 328.0
Aggregate Repurchase Price	$ 354.7
4.70% Senior notes due 2021(2)
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.70%			4.70%
Aggregate Principal Amount Repurchased	$ 156.2
Aggregate Repurchase Price	$ 159.7
Senior Notes | 8.50% senior notes due 2019
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.50%
Aggregate Principal Amount Repurchased		$ 55.0	$ 182.6
Senior Notes | 6.875% Senior notes due 2020(2)
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.875%
Aggregate Principal Amount Repurchased		$ 71.4	$ 256.6
Senior Notes | 4.70% Senior notes due 2021(2)
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.70%

X

- Definition

Debt Instrument, Repurchased Amount Paid in Cash

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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