Retirement Benefit Plans (Net Funded Status and Amounts Recognized in Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated other comprehensive loss (pretax)	$ 65.2	$ 53.5
Accrued benefit liabilty	(167.3)	(155.7)
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Accumulated benefit obligation	170.0	152.8
Fair value of plan assets	69.3	55.0
Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Service cost	10.3	9.4	7.5
Interest cost	9.9	10.0	9.7
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	112.7
Ending balance	110.5	112.7
Accumulated Other Comprehensive Income (Loss) [Abstract]
Unrecognized transition obligation	0.5	0
Unrecognized prior service (benefit)	(1.3)	(1.7)
Unreocognized net actuarial loss	60.1	52.9
Accumulated other comprehensive loss (pretax)	59.3	51.2
Accumulated benefit obligation	208.1	205.9
U.S. Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Beginning balance, benefit obligations	59.2	54.1
Service cost	1.1	1.0
Interest cost	2.6	2.6
Actuarial (gain) loss	2.3	3.9
Benefits paid	(1.4)	(2.3)
Impact on exchange rates	0	0
Plan participants contributions	0	0
Settlements	(0.2)	(0.1)
Curtailments/Amendments	0	0
Ending balance, benefit obligations	63.6	59.2
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	27.8	26.2
Actual return on plan assets	2.1	4.2
Company contributions	1.8	0.1
Plan participants contributions	0	0
Benefits and expenses paid	(1.7)	(2.7)
Impact on exchange rates	0	0
Settlements	(0.2)	0
Ending balance	29.8	27.8
Funded status of plan	(33.8)	(31.4)
Foreign Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Beginning balance, benefit obligations	172.6	164.6
Service cost	9.2	8.4
Interest cost	7.3	7.4
Actuarial (gain) loss	8.6	8.7
Benefits paid	(16.4)	(17.2)
Impact on exchange rates	0.8	1.5
Plan participants contributions	1.5	4.8
Settlements	(7.6)	(5.0)
Curtailments/Amendments	0	(0.6)
Ending balance, benefit obligations	176.0	172.6
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	84.9	82.1
Actual return on plan assets	(0.2)	4.3
Company contributions	14.8	12.4
Plan participants contributions	1.9	5.0
Benefits and expenses paid	(15.6)	(15.7)
Impact on exchange rates	2.1	2.2
Settlements	(7.1)	(5.4)
Ending balance	80.8	84.9
Funded status of plan	(95.2)	(87.7)
Postretirement Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Service cost	0.1	0.1	0.1
Interest cost	1.7	1.8	2.5
Accumulated Other Comprehensive Income (Loss) [Abstract]
Unrecognized transition obligation	0	0
Unrecognized prior service (benefit)	(6.0)	(6.7)
Unreocognized net actuarial loss	11.9	9.0
Accumulated other comprehensive loss (pretax)	5.9	2.3
U.S. Postretirement Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Beginning balance, benefit obligations	36.6	38.4
Service cost	0.1	0.1
Interest cost	1.6	1.8
Actuarial (gain) loss	3.3	(0.9)
Benefits paid	(3.3)	(2.9)
Impact on exchange rates	0	0.1
Plan participants contributions	0	0
Settlements	0	0
Curtailments/Amendments	0	0
Ending balance, benefit obligations	38.3	36.6
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	0	0
Actual return on plan assets	0	0
Company contributions	3.3	2.9
Plan participants contributions	0	0
Benefits and expenses paid	(3.3)	(2.9)
Impact on exchange rates	0	0
Settlements	0	0
Ending balance	0	0
Funded status of plan	$ (38.3)	$ (36.6)