Debt (Schedule of Long term debt and Capital lease obligation) (Details) - USD ($) $ in Millions	Feb. 21, 2018	Dec. 29, 2017	Dec. 30, 2016
Current maturities of long-term debt:
Long-term Debt, Current Maturities		$ 314.2	$ 271.8
Debt Issuance Costs, Current, Net		0.5	0.6
Capital lease obligation and vendor financing agreements		0.2	0.8
Long-term debt:
Long-term Debt, Gross		6,492.6	5,965.8
Debt, Long-term and Short-term, Combined Amount		6,806.8	6,237.6
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		72.2	85.6
Variable rate receivable securitization
Current maturities of long-term debt:
Long-term Debt, Current Maturities		0.0	250.0
Debt Issuance Costs, Current, Net		0.0	0.3
Capital Lease Obligations [Member]
Current maturities of long-term debt:
Debt Issuance Costs, Current, Net		0.0	0.0
2017 Revolving Credit Facility [Member]
Long-term debt:
Long-term Debt, Gross	$ 625.0
Term Loan due Sept 2024 [Member]
Long-term debt:
Long-term Debt, Gross		1,851.2
Long-term Debt [Member]
Long-term debt:
Debt Issuance Costs, Net		71.7	85.0
Senior Notes | 3.50% notes due April 2018
Current maturities of long-term debt:
Long-term Debt, Current Maturities		300.0	0.0
Debt Issuance Costs, Current, Net		0.2	0.0
Long-term debt:
Long-term Debt, Gross		0.0	300.0
Debt Issuance Costs, Net		0.0	0.9
Senior Notes | 4.75% notes due April 2023
Long-term debt:
Long-term Debt, Gross		526.5	600.0
Debt Issuance Costs, Net		4.5	6.1
Senior Notes | 5.75% notes due August 2022
Long-term debt:
Long-term Debt, Gross		884.0	884.0
Debt Issuance Costs, Net		9.5	11.6
Debentures | Four Point Eight Eight Percent Notes [Member]
Long-term debt:
Long-term Debt, Gross		700.0	700.0
Debt Issuance Costs, Net		5.7	8.2
Debentures | 5.625% notes due October 2023
Long-term debt:
Long-term Debt, Gross		738.0	738.0
Debt Issuance Costs, Net		9.7	11.4
Debentures | Five Point Five Percent Notes [Member]
Long-term debt:
Long-term Debt, Gross		692.1	695.0
Debt Issuance Costs, Net		9.0	10.2
Debentures | 2015 Revolving Credit Facility
Long-term debt:
Long-term Debt, Gross		900.0	100.0
Debt Issuance Costs, Net			3.2
Debentures | 2017 Revolving Credit Facility [Member]
Long-term debt:
Long-term Debt, Gross		900.0
Debt Issuance Costs, Net		5.9
Secured Debt | Term loan due March 2021
Current maturities of long-term debt:
Long-term Debt, Current Maturities		0.0	20.0
Debt Issuance Costs, Current, Net		0.0	0.3
Long-term debt:
Long-term Debt, Gross		0.0	1,928.5
Debt Issuance Costs, Net		0.0	33.4
Secured Debt | Receivable securitization, Maturity Date of July 2020 [Member]
Current maturities of long-term debt:
Variable rate receivable securitization			0.0
Long-term debt:
Long-term Debt, Gross		200.0	0.0
Debt Issuance Costs, Net		0.7	0.0
Secured Debt | 4.00% term loan due February 2022
Current maturities of long-term debt:
Long-term Debt, Current Maturities		0.0	1.0
Debt Issuance Costs, Current, Net		0.0	0.0
Long-term debt:
Long-term Debt, Gross		0.0	5.5
Debt Issuance Costs, Net		0.0	0.0
Secured Debt | Variable rate receivable securitization
Current maturities of long-term debt:
Variable rate receivable securitization		0.0
Secured Debt | Term Loan due Sept 2024 [Member]
Current maturities of long-term debt:
Long-term Debt, Current Maturities		14.0	0.0
Debt Issuance Costs, Current, Net		0.3	0.0
Long-term debt:
Long-term Debt, Gross		1,837.2	0.0
Debt Issuance Costs, Noncurrent, Net		26.7	0.0
Debentures | 8.00% debentures due March 2023
Long-term debt:
Long-term Debt, Gross		4.4	4.4
Debt Issuance Costs, Net		0.0	0.0
Debentures | 9.50% debentures due May 2022
Long-term debt:
Long-term Debt, Gross		10.4	10.4
Debt Issuance Costs, Net		$ 0.0	$ 0.0