|
Reconciliation of Weighted-Average Outstanding Shares Used in Calculations of Basic and Diluted EPS (Detail)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items] | |||
| Weighted-average shares outstanding (basic) | 121.9 | 124.8 | 126.3 |
| Effect of dilutive securities: | |||
| Stock options and restricted stock units | 1.8 | 1.7 | 1.6 |
| Weighted-average shares outstanding (diluted) | 123.7 | 126.5 | 127.9 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|