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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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