Retirement Benefit Plans (Net Funded Status and Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated other comprehensive loss (pretax)	$ 44.4	$ 47.6
Accrued benefit liabilty	(142.5)	(148.7)
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Accumulated benefit obligation	196.9	185.3
Fair value of plan assets	93.7	83.7
Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Service cost	11.8	10.8	$ 10.8
Interest cost	6.7	6.9	8.6
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	112.1
Ending balance	103.9	112.1
Accumulated Other Comprehensive Income (Loss) [Abstract]
Unrecognized transition obligation	2.2	2.1
Unrecognized prior service cost (benefit)	1.1	1.2
Unreocognized net actuarial loss	47.4	51.7
Accumulated other comprehensive loss (pretax)	50.7	55.0
Accumulated benefit obligation	205.7	211.1
U.S. Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Beginning balance, benefit obligations	59.2	67.6
Service cost	0.3	0.3
Interest cost	2.2	2.3
Actuarial (gain) loss	(2.9)	(8.6)
Benefits paid	(0.9)	(2.2)
Impact of exchange rates	0.0	0.0
Plan participant contributions	0.0	0.0
Settlements/Curtailments	(8.1)	(0.2)
Ending balance, benefit obligations	49.8	59.2	67.6
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	33.9	35.5
Actual return on plan assets	2.8	0.3
Company contributions	0.0	0.8
Plan participant contributions	0.0	0.0
Benefits and expenses paid	(1.6)	(2.5)
Impact of exchange rates	0.0	0.0
Settlements	(8.1)	(0.2)
Ending balance	27.0	33.9	35.5
Funded status of plan	(22.8)	(25.3)
Foreign Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Beginning balance, benefit obligations	183.3	197.7
Service cost	11.3	10.3
Interest cost	4.5	4.5
Actuarial (gain) loss	7.3	(0.6)
Benefits paid	(7.8)	(11.1)
Impact of exchange rates	(11.0)	(16.8)
Plan participant contributions	0.8	4.2
Settlements/Curtailments	(8.8)	(4.9)
Ending balance, benefit obligations	179.6	183.3	197.7
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	78.2	79.3
Actual return on plan assets	2.2	3.1
Company contributions	14.2	12.1
Plan participant contributions	0.8	4.2
Benefits and expenses paid	(7.8)	(11.1)
Impact of exchange rates	(1.9)	(4.6)
Settlements	(8.8)	(4.8)
Ending balance	76.9	78.2	79.3
Funded status of plan	(102.7)	(105.1)
Postretirement Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Service cost	0.1	0.1	0.1
Interest cost	0.7	0.7	1.1
Accumulated Other Comprehensive Income (Loss) [Abstract]
Unrecognized transition obligation	0.0	0.0
Unrecognized prior service cost (benefit)	(7.3)	(8.7)
Unreocognized net actuarial loss	1.0	1.3
Accumulated other comprehensive loss (pretax)	(6.3)	(7.4)
U.S. Postretirement Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Beginning balance, benefit obligations	18.3	20.4
Service cost	0.1	0.1
Interest cost	0.7	0.7
Actuarial (gain) loss	(0.2)	(1.0)
Benefits paid	(1.9)	(1.8)
Impact of exchange rates	0.0	(0.1)
Plan participant contributions	0.0	0.0
Settlements/Curtailments	0.0	0.0
Ending balance, benefit obligations	17.0	18.3	20.4
Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	1.9	1.8
Plan participant contributions	0.0	0.0
Benefits and expenses paid	(1.9)	(1.8)
Impact of exchange rates	0.0	0.0
Settlements	0.0	0.0
Ending balance	0.0	0.0	$ 0.0
Funded status of plan	$ (17.0)	$ (18.3)