Retirement Plans (Schedule of Benefit Obligation, Plan Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Pension Benefits
Change in benefit obligation:
Projected benefit obligations at beginning of year	$ 538.4	$ 501.7
Service cost	4.5	5.1	$ 5.0
Interest cost	17.5	19.6	18.2
Employee contributions	0.6	0.6
Actuarial (gain) loss	(4.5)	60.0
Benefits and administrative expenses paid	(21.1)	(21.9)
Plan settlements	(23.6)	(17.6)
Net transfer in/(out)	0.6	0.0
Currency translation	(18.9)	(9.1)
Projected benefit obligations at end of year	493.5	538.4	501.7
Change in plan assets:
Fair value of plan assets at beginning of year	473.6	456.0
Actual return on plan assets	12.5	59.7
Employer contributions	13.0	4.9
Employee contributions	0.6	0.6
Benefits and administrative expenses paid	(21.1)	(21.9)
Plan settlements	(23.6)	(17.6)
Currency translation	(17.1)	(8.1)
Fair value of plan assets at end of year	437.9	473.6	456.0
Funded status at end of year	(55.6)	(64.8)
Postretirement Benefits
Change in benefit obligation:
Projected benefit obligations at beginning of year	52.0	53.2
Service cost	0.1	0.1	0.1
Interest cost	1.9	2.1	2.4
Employee contributions	0.0	0.0
Actuarial (gain) loss	2.1	0.5
Benefits and administrative expenses paid	(3.9)	(3.9)
Plan settlements	0.0	0.0
Net transfer in/(out)	0.0	0.0
Currency translation	0.0	0.0
Projected benefit obligations at end of year	52.2	52.0	53.2
Change in plan assets:
Fair value of plan assets at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	3.9	3.9
Employee contributions	0.0	0.0
Benefits and administrative expenses paid	(3.9)	(3.9)
Plan settlements	0.0	0.0
Currency translation	0.0	0.0
Fair value of plan assets at end of year	0.0	0.0	$ 0.0
Funded status at end of year	$ (52.2)	$ (52.0)