Retirement Plans - Summary of Net Pension and SERP Expense Recognized (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost pertaining to benefits earned during the year	$ 6.5	$ 9.0	$ 7.2
Interest cost on projected benefit obligations	19.1	18.5	20.3
Expected return on pension assets	(20.1)	(20.5)	(22.1)
Net amortization loss	5.0	20.9	7.5
Settlement gain	(0.1)	0.0	(1.0)
Net pension expense	10.4	27.9	11.9
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension expense	4.6	20.1	4.3
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension expense	$ 5.8	$ 7.8	$ 7.6