Financial Instruments and Fair Value Measurements (Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - Recurring - USD ($) $ in Millions	Dec. 30, 2016	Sep. 30, 2016
Assets:
Debt and equity securities held in rabbi trusts	$ 33.6	$ 34.6
Foreign exchange forward and option contracts	0.7	0.2
Total assets at fair value	34.3	34.8
Liabilities:
Deferred Compensation Liability, Fair Value	32.5	26.8
Contingent consideration and acquired contingent liabilities	250.5	247.8
Foreign exchange forward and option contracts	3.4	1.6
Total liabilities at fair value	286.4	276.2
Level 1
Assets:
Debt and equity securities held in rabbi trusts	22.8	23.1
Foreign exchange forward and option contracts	0.7	0.2
Total assets at fair value	23.5	23.3
Liabilities:
Deferred Compensation Liability, Fair Value	0.0	0.0
Contingent consideration and acquired contingent liabilities	0.0	0.0
Foreign exchange forward and option contracts	3.4	1.6
Total liabilities at fair value	3.4	1.6
Level 2
Assets:
Debt and equity securities held in rabbi trusts	10.8	11.5
Foreign exchange forward and option contracts	0.0	0.0
Total assets at fair value	10.8	11.5
Liabilities:
Deferred Compensation Liability, Fair Value	32.5	26.8
Contingent consideration and acquired contingent liabilities	0.0	0.0
Foreign exchange forward and option contracts	0.0	0.0
Total liabilities at fair value	32.5	26.8
Level 3
Assets:
Debt and equity securities held in rabbi trusts	0.0	0.0
Foreign exchange forward and option contracts	0.0	0.0
Total assets at fair value	0.0	0.0
Liabilities:
Deferred Compensation Liability, Fair Value	0.0	0.0
Contingent consideration and acquired contingent liabilities	250.5	247.8
Foreign exchange forward and option contracts	0.0	0.0
Total liabilities at fair value	$ 250.5	$ 247.8