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Stockholders' Equity (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified |
12 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Mar. 31, 2011
Accelerated Stock Buyback Program [Member]
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Mar. 24, 2011
Accelerated Stock Buyback Program [Member]
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Dec. 31, 2010
Accelerated Stock Buyback Program [Member]
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Dec. 31, 2011
Share Repurchase Plan [Member]
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Aug. 31, 2014
Share Repurchase Plan [Member]
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Dec. 31, 2010
$550million Medium Term Notes [Member]
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Dec. 31, 2011
$550million Medium Term Notes [Member]
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Dec. 31, 2010
$300million Medium Term Notes [Member]
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Dec. 31, 2010
$345million Converitble Notes [Member]
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Dec. 31, 2011
$345million Convertible Notes March 2011 Exchange [Member]
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| Stock Repurchase Program, Authorized Amount | $ 300,000,000 | ||||||||||||
| Stock Repurchase Program, Period in Force | 3 | ||||||||||||
| Stock Repurchased and Retired During Period, Shares | 2.0 | 25.8 | 3.4 | ||||||||||
| Stock Repurchased and Retired During Period, Value | 500,100,000 | 46,100,000 | |||||||||||
| Principal amount of note | 550,000,000 | 300,000,000 | 345,000,000 | ||||||||||
| Debt Instrument, Convertible, Conversion Ratio | 116.198 | ||||||||||||
| Convertible Debt Exchange Cash Paid Per Unit | 160 | ||||||||||||
| Convertible Notes Face Value Subject To Exchange Min | 1,000 | ||||||||||||
| Carrying Value of Convertible Notes Exchanged | 324,700,000 | 20,300,000 | |||||||||||
| Shares issued for exchange of convertible notes, Shares | 37.7 | ||||||||||||
| Shares issued for exchange of convertible notes | 44,700,000 | 638,000,000 | |||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 4.70% | 10.60% | |||||||||||
| Debt Instrument, Maturity Date | Aug. 15, 2020 | Apr. 15, 2019 | Mar. 15, 2014 | ||||||||||
| Repurchase of shares of common stock, value | 46,100,000 | 500,100,000 | 0 | 500,000,000 | |||||||||
| Daily volume-weighted average share price | $ 17.95 | ||||||||||||
| Shares value issued for exchange of convertible notes | 44,700,000 | ||||||||||||
| Convertible Debt Exchange Cash Paid | 52,000,000 | 3,100,000 | |||||||||||
| Extinguishment of equity component of convertible notes | 25,800,000 | 334,400,000 | 25,800,000 | ||||||||||
| Proceeds from settlement of call options | 0 | 369,500,000 | 0 | ||||||||||
| Payments for Repurchase of Warrants | $ 0 | $ 298,400,000 | $ 0 | ||||||||||
| Shares Issued For Exchange Of Convertible Notes, Number of Shares | 2.3 | ||||||||||||