Pension and Other Postretirement Benefits (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011	Sep. 25, 2010
Net periodic pension costs under retirement plans and other postretirement benefits:
Expected total defined benefit plan employer contributions for fiscal year 2011	$ 13		$ 13
Defined Benefit Plans
Net periodic pension costs under retirement plans and other postretirement benefits:
Service cost - benefits earned during the period	4.8	4.3	14.3	13.0
Interest cost on projected benefit obligation	45.3	46.9	136.5	140.3
Expected return on plan assets	(50.2)	(44.8)	(150.7)	(134.1)
Amortization of prior service cost (gain)	0.2	0.2	0.6	0.6
Amortization of net actuarial loss (gain)	5.1	3.4	15.3	10.1
Less expected participant contributions	(0.4)	(0.5)	(1.2)	(1.5)
Curtailment loss		0
Special termination benefits				1.8
Net periodic pension and postretirement benefit cost	4.8	9.5	14.8	30.2
Canada Defined Benefit Plans
Net periodic pension costs under retirement plans and other postretirement benefits:
Service cost - benefits earned during the period	4.8	4.3	14.3	13.0
Interest cost on projected benefit obligation	18.3	17.8	54.9	53.6
Expected return on plan assets	(18.7)	(17.4)	(56.1)	(52.4)
Amortization of prior service cost (gain)	0.2	0.2	0.6	0.6
Amortization of net actuarial loss (gain)	2.4	0.3	7.1	0.9
Less expected participant contributions	(0.4)	(0.5)	(1.2)	(1.5)
Curtailment loss		0
Special termination benefits				1.8
Net periodic pension and postretirement benefit cost	6.6	4.7	19.6	16.0
Contributions paid to defined benefit plans			9.6
U.S. Benefit Plans
Net periodic pension costs under retirement plans and other postretirement benefits:
Interest cost on projected benefit obligation	(0.2)	0.1	0	0.3
Net periodic pension and postretirement benefit cost	(0.2)	0.1	0	0.3
U.K. Defined Benefit Plans
Net periodic pension costs under retirement plans and other postretirement benefits:
Interest cost on projected benefit obligation	27.2	29.0	81.6	86.4
Expected return on plan assets	(31.5)	(27.4)	(94.6)	(81.7)
Amortization of net actuarial loss (gain)	2.7	3.1	8.2	9.2
Net periodic pension and postretirement benefit cost	(1.6)	4.7	(4.8)	13.9
Other Postretirement Benefits
Net periodic pension costs under retirement plans and other postretirement benefits:
Service cost - benefits earned during the period	0.7	0.6	1.9	1.8
Interest cost on projected benefit obligation	1.9	2.3	5.8	7.0
Amortization of prior service cost (gain)	(1.0)	(0.9)	(2.9)	(2.7)
Amortization of net actuarial loss (gain)	(0.9)		(2.7)
Net periodic pension and postretirement benefit cost	0.7	2.0	2.1	6.1
Canada Other Postretirement Benefits
Net periodic pension costs under retirement plans and other postretirement benefits:
Service cost - benefits earned during the period	0.6	0.6	1.6	1.8
Interest cost on projected benefit obligation	1.9	2.3	5.8	7.0
Amortization of prior service cost (gain)	(1.0)	(0.9)	(2.9)	(2.7)
Amortization of net actuarial loss (gain)	(0.9)		(2.7)
Net periodic pension and postretirement benefit cost	0.6	2.0	1.8	6.1
U.S. Other Postretirement Benefits
Net periodic pension costs under retirement plans and other postretirement benefits:
Service cost - benefits earned during the period	0.1		0.3
Net periodic pension and postretirement benefit cost	$ 0.1		$ 0.3