Adjustments Related to Tax Withholding for Share-based Compensation Since Inception

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- Definition

Stock Repurchased During Period, Average Cost Per Share

+ References

No definition available.

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- Definition

Stock Repurchase From Estate, Estate Holding Percentage - On April 19, 2011, the entity purchased shares of its common stock held by the Estate of Craig H. Neilsen pursuant to a definitive stock purchase agreement entered into on March 25, 2011. Represents the percentage of the Estate's holdings in the Company at the time of purchase.

+ References

No definition available.

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- Definition

Stock Repurchase From Estate of Craig H Neilsen - On April 19, 2011, the entity purchased shares of its common stock held by the Estate of Craig H. Neilsen pursuant to a definitive stock purchase agreement entred into on March 25, 2011. Represents total dollar amount paid for the shares purchased.

+ References

No definition available.

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Stock Repurchase From Estate of Craig H Neilsen - On April 19, 2011, the entity purchased shares of its common stock held by the Estate of Craig H. Neilsen pursuant to a definitive stock purchase agreement entered into on March 25, 2011. Represents the per share price of the shares purchased.

+ References

No definition available.

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Stock Repurchase from the Estate of Craig H. Neilsen - On April 19, 2011, the entity purchased shares of its common stock held by the Estate of Craig H. Neilsen pursuant to a definitive stock purchase agreement entered into on March 25, 2011. Represents total amount of shares purchased.

+ References

No definition available.

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- Definition

Stock Repurchase From Estate, Outstanding Share Percentage - On April 19, 2011, the entity purchased shares of its common stock held by the Estate of Craig H. Neilsen pursuant to a definitive stock purchase agreement entered into on March 25, 2011. Represents the percentage of the Company's outstanding shares that were purchased in this transaction.

+ References

No definition available.

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- Definition

Treasury Stock Acquired, Average Cost Per Share Since Inception

+ References

No definition available.

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 20

-Subparagraph 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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section B

-Paragraph 11A

-Chapter 1

-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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Technical Bulletin (FTB)

-Number 85-6

-Paragraph 3

-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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Stock Repurchases (Details) (USD $)	12 Months Ended				3 Months Ended	12 Months Ended
Stock Repurchases (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 19, 2011	Dec. 31, 2011 ACI 2001 Share Repurchase Program [Member]	Dec. 31, 2012 ACI 2001 Share Repurchase Program [Member]
Schedule of Share Repurchases [Line Items]
Stock Repurchase from the Estate of Craig H. Neilsen, Shares				26,150,000
Stock Repurchase From Estate of Craig H Neilsen, Per Share				$ 17.50
Stock Repurchase From Estate of Craig H Neilsen, Dollar Amount				$ 457,600,000
Stock Repurchase From Estate, Outstanding Share Percentage				45.00%
Stock Repurchase From Estate, Estate Holding Percentage				83.00%
Stock Repurchase Program, Authorized Amount					75,000,000
Stock Repurchased During Period, Shares					300,000	700,000
Payments for Repurchase of Common Stock	14,585,000	467,002,000	1,638,000		5,200,000	11,500,000
Stock Repurchased During Period, Average Cost Per Share					$ 16.23	$ 16.87
Adjustments Related to Tax Withholding for Share-based Compensation	9,800,000
Treasury stock, shares	28,469,217	27,604,260
Treasury Stock, Value	$ 501,815,000	$ 487,230,000
Treasury Stock Acquired, Average Cost Per Share	$ 17.63