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Debt Schedule of Extinguishment of Debt - Exchange Offers (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash		$ 332.5
Debt Instrument, Repurchase Amount		664.5
8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash		81.7
Debt Instrument, Repurchase Amount		163.3
6.875% senior notes due 2024 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash		69.4
Debt Instrument, Repurchase Amount		138.7
4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash		181.4
Debt Instrument, Repurchase Amount		362.5
Senior Notes [Member] | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 194.1	649.5
Debt Instrument, Repurchase Amount	204.5
Senior Notes [Member] | 8.50% Senior notes due 2019 | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	54.6	145.8
Debt Instrument, Repurchase Amount	60.1
Senior Notes [Member] | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount		81.6
Senior Notes [Member] | 6.875% Senior notes due 2020 | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	100.1	129.8
Debt Instrument, Repurchase Amount	105.1
Senior Notes [Member] | 6.875% senior notes due 2024 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount		69.3
Senior Notes [Member] | 4.70% Senior notes due 2021 | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	39.4	373.9
Debt Instrument, Repurchase Amount	$ 39.3
Senior Notes [Member] | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount		181.1
Senior Notes [Member] | 8.00% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount		$ 332.0
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash			$ 332.5

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+ References

No definition available.

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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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