| **Financing Arrangement (Narrative) (Details) (USD $)**                                                             |               |               | 1 Months Ended |             | 1 Months Ended |            |        | 42 Months Ended |               |                  | 1 Months Ended | 9 Months Ended |                       |
|---------------------------------------------------------------------------------------------------------------------|---------------|---------------|----------------|-------------|----------------|------------|--------|-----------------|---------------|------------------|----------------|----------------|-----------------------|
||
| **Financing Arrangements**                                                                                          |          |          |                |        |           |       |   |            |          |             |           |           |                  |   |   |   |   |
| Principal amount                                                                                                    | $ 632,500,000 | $ 632,500,000 |                |        |           |       |   |            | $ 632,500,000 |             |           |           |                  |   |   |   |   |
| Contractual interest rate of 0.75% Convertible Senior Notes due 2016                                                | 0.75%         | 0.75%         |                |        |           |       |   |            |          |             |           |           |                  | 0.75% | 0.75% |   |   |
| Convertible Senior Notes due description                                                                            |          |          |                |        |           |       |   |            |          |             |           |           | 2016                  | 2016 |   |   |   |
| 0.75% Convertible Senior Notes due 2016 maturity date                                                               |          |          |                |        |           |       |   |            |          |             |           |           | Jul. 15,         2016 |   |   |   |   |
| Conversion rate of Notes                                                                                            |          |          |                |        |           |       |   |            |          |             |           |           | 31.5075               |   |   |   |   |
| Face amount of Notes                                                                                                |          |          |                |        |           |       |   |            |          |             |           |           |                  |   | 1,000 |   |   |
| Initial conversion price per share of Notes                                                                         |          |          |                |        |           |       |   |            |          |             |           |           |                  |   | $ 31.74 |   |   |
| Number of trading days greater than or equal to the initial conversion price                                        |          |          |                |        |           |       |   |            |          |             |           |           | 20                    |   |   |   |   |
| Consecutive trading days under conversion trigger                                                                   |          |          |                |        |           |       |   |            |          |             |           |           | 30                    |   |   |   |   |
| Trigger price as percent of conversion price                                                                        |          |          |                |        |           |       |   |            |          |             |           |           | 130.00%               |   |   |   |   |
| Trigger price                                                                                                       |          |          |                |        |           |       |   |            |          |             |           |           | $ 41.26               |   |   |   |   |
| Number of trading day that trading price falls below 98% of last reported sales price multiplied by conversion rate |          |          |                |        |           |       |   |            |          |             |           |           | 5                     |   |   |   |   |
| Consecutive trading days under conversion trigger, trading price                                                    |          |          |                |        |           |       |   |            |          |             |           |           | 10                    |   |   |   |   |
| Debt trading price as a percentage of stock price times conversion rate                                             |          |          |                |        |           |       |   |            |          |             |           |           | 98.00%                |   |   |   |   |
| Convertible Senior Notes, Carrying Value                                                                            | 554,000,000   | 539,000,000   | [1]            |        |           |       |   |            |          |             |           |           |                  |   |   | 525,000,000 |   |
| Effective interest rate                                                                                             |          |          |                |        |           |       |   |            |          |             |           |           |                  |   | 4.54% |   |   |
| Debt issuance costs                                                                                                 |          |          |                |        |           |       |   |            |          |             | 2,000,000      |           |                  |   | 15,000,000 | 13,000,000 | 2,000,000 |
| Debt instrument remaining discount amortization period                                                              |          |          |                |        |           |       |   |            |          |             |           |           |                  | 3 years 6 months |   |   |   |
| Shares covered by Hedge Transactions                                                                                |          |          |                |        | 19,900,000     |       |   |            |          |             |           |           |                  |   |   |   |   |
| Strike price for convertible note hedge                                                                             |          |          |                |        | $ 31.74        |       |   |            |          |             |           |           |                  |   |   |   |   |
| Amount paid for Convertible Note Hedge                                                                              |          |          |                | 107,000,000 |           |       |   |            |          |             |           |           |                  |   |   |   |   |
| Shares covered by warrants issuance                                                                                 |          |          |                |        |           |       |   | 19,900,000      |          |             |           |           |                  |   |   |   |   |
| Strike price of warrants                                                                                            |          |          |                |        |           |       | 41.14  | 41.14           |          |             |           |           |                  |   |   |   |   |
| Proceeds from Warrants transaction                                                                                  |          |          |                |        |           | 65,000,000 |   |            |          |             |           |           |                  |   |   |   |   |
| **Line of Credit Facility**                                                                                         |          |          |                |        |           |       |   |            |          |             |           |           |                  |   |   |   |   |
| Line of Credit Facility, Maximum Borrowing Capacity                                                                 |          |          |                |        |           |       |   |            |          |             |           | 500,000,000    |                  |   |   |   |   |
| Line of Credit Facility Term                                                                                        |          |          |                |        |           |       |   |            |          | 3 years 6 months |           |           |                  |   |   |   |   |
| Option To Request Additional Commitments On Credit Facility                                                         |          |          |                |        |           |       |   |            |          |             |           | $ 250,000,000  |                  |   |   |   |   |
|                                                                                                                     |
| [1]Derived from audited consolidated financial statements.                                                          |

| X                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Consecutive Trading Days Under Conversion Trigger.
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Consecutive Trading Days Under Conversion Trigger, Trading Price
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| X                                                                                                                                                                                                                                               |
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| - Definition
Convertible Note Hedge Strike Price
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| X                                                                                                                                                                                                                                                                   |
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| - Definition
Cost of hedge net of proceeds from warrants.
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| X                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
Debt Instrument, Convertible, Percentage Floor of Trading Price to Common Stock Price Multiplied by Conversion Rate
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Debt Instrument, Convertible, Trigger Price Over Conversion Price, Percent
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Debt Instrument, Convertible, Trigger Price, Percent
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| - Definition
LineofCreditFacilityTerm1
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Option to request additional commitments on credit facility.
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| X                                                                                                                                                                                                                                                        |
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| - Definition
Shares Covered By Convertible Note Hedge
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| - Definition
Trading Days Of Greater Than Or Equal To One Hundred Thirty Percent Of Initial Conversion Price.
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| - Definition
Trading Days Of Trading Price Below Ninety Eight Percent Of Last Reported Sale Price Multiplied By Conversion Rate
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| - Definition
The exercise price of each class of warrants or rights outstanding.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The price per share of the conversion feature embedded in the debt instrument.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fee that accompanies borrowing money under the debt instrument.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.
+ References
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| - Definition
Interest rate stated in the contractual debt agreement.
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| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
+ References
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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.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5
+ Details**Name:**us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
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| - Definition
The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 14 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
+ Details**Name:**us-gaap_PaymentsForHedgeFinancingActivities**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |