Accumulated Other Comprehensive Income (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 30, 2016		Dec. 25, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Plan settlements	$ 45.0		$ 0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	45.4		2.8
Amortization of pension and post-retirement plans, tax	(16.7)		(1.0)
Amortization of pension and post-retirement plans, net of tax	28.7		1.8
Total reclassifications for the period	28.9		(56.8)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of unrealized gain on derivatives, before tax	0.2		0.1
Amortization of unrealized gain on derivatives, tax	0.0		0.0
Amortization of unrealized gain on derivatives, net of tax	0.2		0.1
Amortization of pension and post-retirement plans, net actuarial loss	1.0	[1]	2.6
Amortization of pension and post-retirement plans, prior service cost	(0.6)	[1]	(0.6)
Disposal of discontinued operations	0.0		0.8
Currency translation	$ 0.0		$ (58.7)

[1] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost. See Note 12 for additional details.