Debt (Senior Secured Credit Facility Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended			12 Months Ended		12 Months Ended
	Dec. 30, 2011	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2011 Senior Secured Term Loan A Facility [Member]	Mar. 31, 2011 Senior Secured Term Loan B Facility [Member]	Mar. 31, 2011 Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2011 Senior Secured Revolving Credit Facility [Member]	Mar. 31, 2011 U.S. Dollar Component [Member] Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2011 U.S. Dollar Component [Member] Canadian Term Loan [Member]	Mar. 31, 2011 Multi-Currency Component [Member] Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing under the credit facility			$ 1,275	$ 525	$ 500	$ 250		$ 175		$ 75
Credit facility maturity date				March 2016	January 2017	March 2016
Spread of basis points				2.25%	3.00%	2.25%
Annual commitment fee percentage on unused portion of credit facility	0.38%
Extinguishment of debt amount							1,100		22
Loss on early extinguishment of debt		$ 12.8
Weighted average interest rate on facility		3.00%