Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Disclosure Income Taxes Additional Information [Abstract]
Tax Cuts and Jobs Act of 2017					$ 460.7
Income taxes on continuing operations	$ 56.6	$ 79.9	$ 139.3	$ 240.3
Document Period End Date			Sep. 29, 2018
Effective tax rate	18.60%	22.50%	16.40%	20.30%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 23.1
Business Combination, Acquisition Related Costs	19.50%	23.00%	15.60%	23.70%
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)			$ 17.4		252.5
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax (Expense) Benefit					276.1
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit					184.6
Deferred Tax Liabilities, Gross, Noncurrent					$ 4.9