Segment Reporting Income (Loss) From Continuing Operations (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011	Sep. 25, 2010
Segment Reporting
Income (loss) from continuing operations before income taxes	$ 225.4	$ 318.6	$ 592.4	$ 684.2
Canada
Segment Reporting
Income (loss) from continuing operations before income taxes	162.0	161.6	346.0	347.8
U.S.
Segment Reporting
Income (loss) from continuing operations before income taxes	99.4	135.3	372.4	389.9
U.K.
Segment Reporting
Income (loss) from continuing operations before income taxes	25.3	34.3	64.4	67.8
MCI and Corporate
Segment Reporting
Income (loss) from continuing operations before income taxes	$ (61.3)	$ (12.6)	$ (190.4)	$ (121.3)