Acquisition (Narrative) (Details) (USD $)	0 Months Ended		3 Months Ended											12 Months Ended						0 Months Ended	12 Months Ended				12 Months Ended
	Aug. 17, 2010	Aug. 11, 2009	Dec. 31, 2011	Oct. 01, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011		Oct. 02, 2010		Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011		Jan. 01, 2011		Jan. 02, 2010		Aug. 17, 2009 Cliffstar [Member]	Dec. 31, 2011 Cliffstar [Member]	Jan. 01, 2011 Cliffstar [Member]	Oct. 02, 2010 Cliffstar [Member]	Aug. 17, 2010 Cliffstar [Member] years	Dec. 31, 2011 8.125% Senior Notes Due 2018 [Member]	Dec. 31, 2011 ABL Facility [Member]
Business Acquisition [Line Items]
Date of acquisition																				August 17, 2010
Interim payments to the seller			$ 8,600,000	$ 21,000,000	$ 21,000,000									$ 8,600,000
Settlement payments to seller			900,000											900,000
Additional contingent consideration for business acquisition														12,100,000
Estimated fair value payable to seller			34,300,000											34,300,000
Deferred consideration payments					4,700,000
Acquisition, payable in cash																								503,000,000
Acquisition, deferred consideration to be paid								13,200,000								13,200,000								14,000,000
Deferred consideration due (in years)																								3
Acquisition, contingent consideration								32,200,000								32,200,000								55,000,000
Operating income			4,300,000	29,000,000		42,900,000	24,500,000	15,300,000	[1]	19,500,000	[2]	39,100,000	25,100,000	100,700,000		99,000,000		97,400,000				5,200,000
Acquisition, contingent consideration payable upon achievement of milestones																								15,000,000
Senior notes, face amount																									375,000,000
Interest rate on notes																									8.125%
Senior notes, due date																									2018
Common shares issued, shares	13,340,000	9,435,000																			13,400,000
Credit facility, current barrowing capacity																										275,000,000
Acquisition related costs																						7,200,000	7,200,000
External revenue			$ 549,200,000	$ 611,300,000		$ 640,000,000	$ 534,100,000	$ 528,800,000	[1]	$ 486,900,000	[2]	$ 424,700,000	$ 362,900,000	$ 2,334,600,000	[3]	$ 1,803,300,000	[4]	$ 1,596,700,000	[5]			$ 232,200,000

[1] During the fourth quarter of 2010 we recorded a reduction to the contingent consideration earn-out accrual of $20.3 million.

[2] During the third quarter of 2010, we completed the Cliffstar Acquisition. We recorded $7.2 million of transaction costs related to the acquisition. These costs were recorded in SG&A.

[3] Intersegment revenue between North America and the other reporting segments was $14.7 million for the year ended December 31, 2011.

[4] Intersegment revenue between North America and the other reporting segments was $19.0 million for the year ended January 1, 2011.

[5] Intersegment revenue between North America and the other reporting segments was $14.0 million for the year ended January 2, 2010.