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Debt Schedule of Extinguishment of Debt - Exchange Offers (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Cash Consideration		$ 332.5
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%
8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Cash Consideration		81.7
Total Consideration		163.3
6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	6.875%		6.875%
6.875% senior notes due 2024 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Cash Consideration		69.4
Total Consideration		138.7
4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	4.70%		4.70%
4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Cash Consideration		181.4
Total Consideration		362.5
8.00% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	8.00%
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 | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Aggregate repurchase price		81.6
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 | 6.875% senior notes due 2024 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Aggregate repurchase price		69.3
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
Senior Notes | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Aggregate repurchase price		181.1
Senior Notes | 8.00% Senior notes due 2024
Extinguishment of Debt [Line Items]
Aggregate repurchase price		$ 332.0
Senior Notes
Extinguishment of Debt [Line Items]
Cash Consideration			$ 332.5

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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

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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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