Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Sep. 30, 2011 years
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company granted stock options, grants in period	452,800
Weighted average fair value per stock option	$ 2.64
Unrecognized compensation expense, net of estimated forfeitures	$ 18.3
Unrecognized compensation, weighted average vesting period, years	1.3
Options outstanding	50,900,000
Options exercisable	40,600,000
Weighted average exercise price, options outstanding	$ 7.63
Weighted average exercise price, options exercisable	$ 8.25
Restricted Share Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, net of estimated forfeitures	80.0
Unrecognized compensation expense, awards with market condition	$ 15.0
Unrecognized compensation, weighted average vesting period, years	3.1
Granted, number of shares	8,274,205
Grants made to key employees	1,500,000
Actual number of awards issued, minimum	0
Actual number of awards issued, maximum	2,200,000
Vesting life of awards with market condition, years	4
Awards with market condition, grant date fair value	$ 7.78

The maximum amount of shares that could be issued to key employees that were granted awards with market conditions.

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The minimum amount of shares that could be issued to key employees that were granted awards with market conditions.

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Employee Service Share-Based Compensation Nonvested Awards Contingent Compensation Cost Not Yet Recognized

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Employee service share based compensation unrecognized compensation costs on nonvested awards outstanding weighted average period of recognition.

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- Definition

Grants made to key employees.

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- Definition

Vesting period for awards granted whereby vesting is contingent upon meeting a certain market condition.

+ Details

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options grants in period that had market condition weighted average grant date fair value.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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-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

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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.

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-Name Accounting Standards Codification

-Topic 718

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- Definition

Net number of share options (or share units) granted during the period.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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-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.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-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.

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