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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 25, 2013	Dec. 26, 2012	Dec. 28, 2011	Dec. 29, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans	3
Shares available for grant	800,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Contractual life	10 years
Aggregate intrinsic value of the options exercised	$ 2.6	$ 1.7	$ 3.6
Weighted-average fair value per option of options granted			$ 1.98
Unrecognized compensation cost related to unvested stock option awards outstanding	0.1
Unrecognized compensation cost, expected weighted average period	0 years 1 month 10 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, expected weighted average period	1 year 1 month 28 days
Nonvested performance shares outstanding (shares)	700,000	800,000
Fair value of shares that vested	3.1	1.9	2.0
Equity awards granted (shares)	331,000	397,000	416,000
Equity awards, grant date fair value (US$ per share)	$ 8.05	$ 6.05	$ 3.99
Cash payments	1.2	1.0	0.8
Common stock shares issued (shares)	300,000	200,000	300,000
Accrued compensation included as a component of other current liabilities	0.7	0.4
Accrued compensation included as a component of other noncurrent liabilities	1.9	0.9
Unrecognized compensation cost related to unvested performance share awards outstanding	4.3
Equity awards outstanding, vested and nonvested (shares)	832,000	933,000	1,276,000	1,450,000
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted (shares)	100,000
Equity awards, grant date fair value (US$ per share)	$ 5.95
Common stock shares issued (shares)	100,000
Equity awards outstanding, vested and nonvested (shares)	800,000	700,000
Unrecognized compensation cost related to unvested board deferred stock units outstanding	0.2
Unrecognized compensation cost related to unvested board deferred stock units, expected weighted average period	0 years 4 months 0 days
2012 Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	3,600,000
Performance award granted January 2013 [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested performance shares outstanding (shares)	300,000
Equity awards granted (shares)	331,000
Employee performance-based target cash awards	2.1
Equity awards, grant date fair value (US$ per share)	$ 8.05
Performance period	3 years
Minimum percentage of target awards to be earned (in hundredths)	0.00%
Maximum percentage of target awards to be earned (in hundredths)	200.00%
Performance-based target cash awards outstanding	$ 2.1

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans for directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to directors as compensation.

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Description of the maximum percentage of performance shares and cash target awards that could be earned.

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Number of restricted stock units outstanding, including both vested and non-vested.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer).

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of share instruments newly issued under a share-based compensation plan.

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