Earnings (Loss) per Common Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Earnings (Loss) per Common Share [Abstract]
Net earnings (loss)	$ 4.7	$ (7.2)	$ 101.5	$ (6.5)
Weighted average outstanding shares - basic (in shares)	89.4	88.8	89.3	88.7
Dilutive effect of common stock equivalents (in shares)	2.4	0	3.0	0
Weighted average outstanding shares - diluted (in shares)	91.8	88.8	92.3	88.7
Basic earnings (loss) per common share (in dollars per share)	$ 0.05	$ (0.08)	$ 1.14	$ (0.07)
Diluted earnings (loss) per common share (in dollars per share)	$ 0.05	$ (0.08)	$ 1.10	$ (0.07)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in shares)	9.4	9.9	9.4	9.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	4.8	4.5	4.8	4.5
Anti-dilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	4.7	5.0	2.9	5.1

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

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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.

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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

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