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Debt Schedule of Extinguishment of Debt - Exchange Offers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			$ 649.5
Debt Instrument, Repurchased Amount Paid in Cash			332.5	$ 332.5
Debt Instrument, Repurchase Amount			664.5
Gain (Loss) on Extinguishment of Debt	$ 6.2
Amortization of Debt Discount (Premium)	$ 3.4	$ 5.0
8.50% Senior Notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			145.8
Debt Instrument, Interest Rate, Stated Percentage	8.50%
8.50% Senior notes due 2019 exchanged for 8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			81.6
Debt Instrument, Repurchased Amount Paid in Cash			81.7
Debt Instrument, Repurchase Amount			163.3
6.875% Senior Notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			129.8
Debt Instrument, Interest Rate, Stated Percentage	6.875%			6.875%
6.875% Senior notes due 2020 exchanged for 8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			69.3
Debt Instrument, Repurchased Amount Paid in Cash			69.4
Debt Instrument, Repurchase Amount			138.7
4.70% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			373.9
Debt Instrument, Interest Rate, Stated Percentage	4.70%
4.70% Senior notes due 2021 exchanged for 8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			181.1
Debt Instrument, Repurchased Amount Paid in Cash			181.4
Debt Instrument, Repurchase Amount			362.5
8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 332.0
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Senior Notes [Member] | 8.50% Senior Notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.50%
Senior Notes [Member] | 6.875% Senior Notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.875%
Senior Notes [Member] | 4.70% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%		4.70%
Convertible Debt [Member] | 8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)	$ 3.5
Amortization of Debt Issuance Costs	$ 2.7

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