| **Financing Arrangement (0.75% Convertible Senior Notes Due 2016) (Details) $ / shares in Units, shares in Thousands** | 1 Months Ended | 3 Months Ended | 6 Months Ended |               |
|------------------------------------------------------------------------------------------------------------------------|----------------|----------------|----------------|---------------|
||
| **Financing Arrangements**                                                                                             |           |           |           |          |   |
| Repayments of Convertible Debt                                                                                         |           |           | $ 163,000,000  | $ 198,000,000 |   |
| Gain (Loss) on Extinguishment of Debt                                                                                  |           |           | 0              | $ 6,000,000   |   |
| Convertible Debt                                                                                                       |           |           |           |          |   |
| **Financing Arrangements**                                                                                             |           |           |           |          |   |
| Principal amount                                                                                                       |           |           |           |          | $ 633,000,000 |
| Contractual interest rate of 0.75% Convertible Senior Notes due 2016                                                   |           |           |           |          | 0.75% |
| Debt Instrument, Frequency of Periodic Payment                                                                         | semiannually   |           |           |          |   |
| Debt Instrument, Issuance Date                                                                                         | Jul. 14,  2011 |           |           |          |   |
| Convertible Senior Notes due description                                                                               | 2016           |           |           |          |   |
| Conversion rate of Notes                                                                                               | 31.5075        |           |           |          |   |
| Face amount of Notes                                                                                                   |           |           |           |          | $ 1,000 |
| Debt Instrument, Convertible, Conversion Price | $ / shares                                                            |           |           |           |          | $ 31.74 |
| Debt Conversion, Original Debt, Amount                                                                                 |           | $ 136,000,000  |           |          |   |
| Repayments of Convertible Debt                                                                                         |           | $ 136,000,000  | $ 163,000,000  |          |   |
| Debt Conversion, Converted Instrument, Shares Issued | shares                                                          |           | 2,500          | 2,900          |          |   |
| Debt Conversion, Converted Instrument, Amount                                                                          |           | $ 193,000,000  | $ 222,000,000  |          |   |
| Gain (Loss) on Extinguishment of Debt                                                                                  |           |           | $ (300,000)    |          |   |
| Shares Received Under Convertible Note Hedge | shares                                                                  |           | 2,500          |           |          |   |

| X                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Shares Received Under Convertible Note Hedge
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The price per share of the conversion feature embedded in the debt instrument.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.
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| - Definition
Face (par) amount of debt instrument at time of issuance.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the frequency of periodic payments (monthly, quarterly, annual).
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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| - Definition
Date the debt instrument was issued, in CCYY-MM-DD format.
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| - Definition
Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.
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| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
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| - Definition
The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.
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