Equity-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 01, 2011	Dec. 30, 2011		Dec. 31, 2010	Jan. 01, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based grants vesting period in years, minimum		one
Equity-based grants vesting period in years, maximum		four
Vesting period for a majority of equity-based compensation awards granted in years		three
Number of shares for equity-based compensation grants approved by shareholders		53,889,977
Number of shares for equity-based compensation approved by shareholders available for grant		20,824,624
Contractual term of stock options and stock appreciation rights, years		10
Aggregate intrinsic value of exercised stock options		$ 1.5		$ 4.5	$ 0.3
Unrecognized equity-based compensation cost		26.7
Weighted average period for equity-based compensation recognition, years		1.7
Weighted average fair value of stock options granted		$ 2.00		$ 2.97	$ 2.12
Performance Stock Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for each PSU granted, maximum		2
Weighted average grant date fair value		$ 5.57	[1]
Performance stock units granted		1,660,290		1,145,723	959,100
Weighted average price of performance stock units granted during period		$ 5.39		$ 7.72	$ 3.75
Results of 2010 operating earnings strategic goal target				237.0
Results of 2009 operating earnings strategic goal target					154
Additional shares granted for performance stock units subject to continued employment				183,737	596,506
Number of common shares vested and issued for performance stock units granted in 2009	492,086
Percentage of performance stock units earned				125.00%	165.00%
Shares earned per performance stock unit				1.25	1.65
Number of common shares vested and issued for performance stock units granted in 2010	306,155
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair market value of restricted stock vested		$ 11.4		$ 16.9	$ 9.5
Weighted average grant date fair value		$ 5.29		$ 8.68	$ 5.28

[1] This includes the additional 183,737 shares from the 2010 grant that were earned based on 2010 operating earnings and strategic goals.