Financial Instruments and Fair Value Measurements (Schedule of Carrying Amount and Fair Value of Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 30, 2016	Sep. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Rate Receivable Securitization	$ 250.0	$ 235.0
Variable Rate Receivable Securitization, Fair Value	250.0	235.0
Long-term Debt, Gross	5,965.8	5,878.5
Term Loan Due March 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable	1,948.5	1,953.5
Loans Payable, Fair Value Disclosure	1,953.2	1,951.8
4.00% Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Payable	6.5	7.1
Loans Payable, Fair Value Disclosure	6.5	7.1
Secured Debt | 4.00% Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Gross	5.5	6.0
Senior Notes | 3.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	298.7	299.6
Long-term Debt, Gross	300.0	300.0
Senior Notes | 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	850.3	869.3
Long-term Debt, Gross	884.0	884.0
Senior Notes | 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	520.9	539.5
Long-term Debt, Gross	600.0	600.0
Unsecured Debt | 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	699.5	712.4
Long-term Debt, Gross	700.0	700.0
Unsecured Debt | 5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	682.4	710.2
Long-term Debt, Gross	738.0	740.0
Unsecured Debt | 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	615.7	663.6
Long-term Debt, Gross	695.0	700.0
Unsecured Debt | 2015 Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	100.0	0.0
Long-term Debt, Gross	100.0	0.0
Debentures | 9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	12.0	12.1
Long-term Debt, Gross	10.4	10.4
Debentures | 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt, fair value	4.9	4.9
Long-term Debt, Gross	$ 4.4	$ 4.4