Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization			$ 1.9	$ 0.9
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.7	$ 2.8	5.5	5.6
Interest cost	1.7	2.2	3.5	4.4
Expected return on plan assets	(1.4)	(1.5)	(2.8)	(3.1)
Settlement/curtailment	0.4	0.0	0.4	0.0
Net amortization	1.1	0.6	2.1	1.2
Net periodic benefit cost	4.5	4.1	8.7	8.1
Post-retirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.1	0.0	0.1
Interest cost	0.2	0.2	0.4	0.6
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)	(0.1)	(0.6)	(0.3)
Net periodic benefit cost	$ (0.1)	$ 0.2	$ (0.2)	$ 0.4