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Debt Tender Offers (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 01, 2016	Jun. 30, 2016	Mar. 07, 2016	Dec. 31, 2015
Extinguishment of Debt [Line Items]
Tender Offer						$ 750.0
Gain (Loss) on Extinguishment of Debt		$ 279.0	$ (33.5)
Tender Offer [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount					$ 860.7
Debt Instrument, Repurchase Amount					$ 622.3
four point seven percent notes, eight point five percent notes, six point eight seven five percent notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 268.2	268.2		$ 188.7
Debt Instrument, Repurchase Amount	$ 239.8	$ 239.8		$ 177.3
Eight Point Five Zero Percent Senior Notes Member
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.50%	8.50%					8.50%
Debt Instrument, Repurchased Face Amount	$ 60.3	$ 60.3
Debt Instrument, Repurchase Amount	$ 53.9	$ 53.9
Discount on Principal	10.60%	10.60%
Long-term Debt, Maturities, Repayments of Principal in Year Three	$ 439.9	$ 439.9
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%					6.875%
Debt Instrument, Repurchased Face Amount	$ 219.2	$ 219.2
Debt Instrument, Repurchase Amount	$ 181.5	$ 181.5
Discount on Principal	17.20%	17.20%
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 680.8	$ 680.8
Four Point Seven Zero Percent Senior Notes Member
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%	4.70%					4.70%
Debt Instrument, Repurchased Face Amount	$ 817.0	$ 817.0
Debt Instrument, Repurchase Amount	$ 609.0	$ 609.0
Discount on Principal	25.50%	25.50%
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 683.0	$ 683.0
Four Point Five Percent Senior Notes Member [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%					4.50%
Debt Instrument, Repurchased Face Amount	$ 1.7	$ 1.7
Debt Instrument, Repurchase Amount	$ 0.9	$ 0.9
Discount on Principal	47.10%	47.10%
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 623.2	$ 623.2
Five Point Two Percent Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.20%	5.20%					5.20%
Debt Instrument, Repurchased Face Amount	$ 30.7	$ 30.7
Debt Instrument, Repurchase Amount	$ 16.8	$ 16.8
Discount on Principal	45.30%	45.30%
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 669.3	$ 669.3
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Gain (Loss) on Extinguishment of Debt	18.2	279.0
Senior notes repurchased in 2016 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	1,128.9	1,128.9
Debt Instrument, Repurchase Amount	$ 862.1	$ 862.1
Discount on Principal	23.60%	23.60%

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