Reconciliation of Weighted Average Number of Common Shares Outstanding (Detail) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jul. 01, 2011	Jun. 30, 2012	Jul. 01, 2011
Earnings Per Share [Line Items]
Weighted average common shares outstanding - basic	139.5	143.3	140.9	143.0
Dilutive effect of stock options	2.7	2.6	2.7	2.6
Weighted average common shares outstanding - diluted	142.2	145.9	143.6	145.6
Antidilutive stock options outstanding	1.5	1.1	1.6	1.1

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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+ 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