Retirement Plans (Schedule of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.8	$ 2.4	$ 2.7
Interest cost	13.2	14.5	15.4
Expected return on plan assets	(16.7)	(18.9)	(20.5)
Amortization of net actuarial loss	11.3	9.2	8.0
Amortization of prior service cost	0.0	0.0	0.0
Loss on plan settlements	8.1	5.9	3.8
Net period benefit cost (credit)	$ 17.7	13.1	9.4
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Allocation of total pension plan assets	100.00%
Allocation of total projected benefit obligation	96.00%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.1	0.1	0.1
Interest cost	2.0	1.9	2.1
Expected return on plan assets	0.0	0.0	0.0
Amortization of net actuarial loss	0.0	0.0	0.0
Amortization of prior service cost	(2.1)	(4.0)	(9.3)
Loss on plan settlements	0.0	0.0	0.0
Net period benefit cost (credit)	$ 0.0	$ (2.0)	$ (7.1)