Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization			$ 2.7	$ 1.7
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.6	$ 2.6	8.1	8.2
Interest cost	1.8	2.1	5.3	6.5
Expected return on plan assets	(1.4)	(1.5)	(4.2)	(4.6)
Settlement/curtailment	0.1	0.4	0.5	0.4
Net amortization	1.0	0.7	3.1	1.9
Net periodic benefit cost	4.1	4.3	12.8	12.4
Post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.1	0.0	0.1	0.1
Interest cost	0.1	0.3	0.5	0.9
Expected return on plan assets	0.0	0.0	0.0	0.0
Settlement/curtailment	0.0	0.0	0.0	0.0
Net amortization	(0.3)	(0.3)	(0.9)	(0.6)
Net periodic benefit cost	$ (0.1)	$ 0.0	$ (0.3)	$ 0.4