Net Income Per Common Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share, Basic [Abstract]
Net income attributable to AGCO Corporation and subsidiaries	$ 84.4	$ 62.3	$ 298.1	$ 135.3
Weighted average number of common shares outstanding	96.4	92.9	95.1	92.7
Basic net income per common share attributable to AGCO Corporation and subsidiaries	$ 0.88	$ 0.67	$ 3.13	$ 1.46
Earnings Per Share, Diluted [Abstract]
Net income attributable to AGCO Corporation and subsidiaries for purposes of comuting diluted net income per share	$ 84.4	$ 62.3	$ 298.1	$ 135.3
Weighted average number of common shares outstanding	96.4	92.9	95.1	92.7
Dilutive stock options, SSARs, performance share awards and restricted stock awards	0.2	0.3	0.3	0.5
Weighted average assumed conversion of contingently convertible senior subordinated notes	0.3	2.6	2.5	2.8
Weighted average number of common and common equivalent shares outstanding for purposes of computing diluted earnings per share	96.9	95.8	97.9	96.0
Diluted net income per common share attributable to AGCO Corporation and subsidiaries	$ 0.87	$ 0.65	$ 3.04	$ 1.41
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.3	0.5	0.3	0.5

Incremental common shares attributable to conversion of contingently convertible senior subordinated notes.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 21

-Article 9

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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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-Number 210

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-Appendix A

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

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