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Debt Schedule of Extinguishment of Debt - Open Market Repurchases (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Total Consideration		$ 664.5
8.50% Senior notes due 2019
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	8.50%		8.50%
6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	6.875%		6.875%
4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	4.70%		4.70%
Senior Notes | Senior Notes
Extinguishment of Debt [Line Items]
Aggregate Principal Amount Repurchased	$ 194.1	649.5
Total Consideration	204.5
Senior Notes | 8.50% Senior notes due 2019 | Senior Notes
Extinguishment of Debt [Line Items]
Aggregate Principal Amount Repurchased	54.6	145.8
Total Consideration	60.1
Senior Notes | 6.875% Senior notes due 2020 | Senior Notes
Extinguishment of Debt [Line Items]
Aggregate Principal Amount Repurchased	100.1	129.8
Total Consideration	105.1
Senior Notes | 4.70% Senior notes due 2021 | Senior Notes
Extinguishment of Debt [Line Items]
Aggregate Principal Amount Repurchased	39.4	$ 373.9
Total Consideration	$ 39.3

X

- 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

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+ References

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- Definition

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+ References

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