Net Income (Loss) Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 25, 2012
Earnings Per Share [Abstract]
Loss from continuing operations available for common stockholders (A)	$ (8.2)	$ (2.5)
Weighted average outstanding shares of common stock (B) (in shares)	56.6	32.5
Dilutive effect of employee stock options and awards (in shares)	0	0
Common stock and common stock equivalents (C) (in shares)	56.6	32.5
Basic (A/B) (in dollars per share)	$ (0.14)	$ (0.08)
Diluted (A/C) (in dollars per share)	$ (0.14)	$ (0.08)
Shares from stock options and awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of shares from stock options and awards	5.5	2.8

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 Statement of Financial Accounting Standard (FAS)

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+ Details

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

+ References+ Details

- Definition

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

+ References

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-Name Regulation S-X (SX)

-Number 210

-Section 04

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+ Details

- Definition

The amount of net income (loss) derived from continuing operations during 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.

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-Topic 225

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-Number 210

-Section 03

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+ 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.

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-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details