Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Reconciliation of the number of shares used for calculating basic and diluted earnings per common share
Net income attributable to the Company	$ 211.1	$ 191.1	$ 331.1	$ 294.4
Basic weighted-average number of common shares outstanding	303.6	311.2	304.4	312.3
Effect of stock options and other dilutive securities	5.6	2.0	5.0	2.4
Diluted weighted-average number of common shares outstanding	309.2	313.2	309.4	314.7
Basic EPS	$ 0.70	$ 0.61	$ 1.09	$ 0.94
Diluted EPS	$ 0.68	$ 0.61	$ 1.07	$ 0.94
Restricted Stock [Member]
Common Shares Outstanding (Textuals) [Abstract]
Outstanding shares not included in the computation of diluted earnings per share for both restricted stock and stock options			1.6	3.4
Stock Options [Member]
Common Shares Outstanding (Textuals) [Abstract]
Outstanding shares not included in the computation of diluted earnings per share for both restricted stock and stock options	10.0	24.4	10.8	23.8

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

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-Name Accounting Standards Codification
-Glossary Antidilution
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6508534

+ Details

- Definition

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

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

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

+ References

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+ Details