Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Components of net periodic benefit cost (credit)
Recognized loss on settlements		$ 41.4		$ 41.4
U.S.
Components of net periodic benefit cost (credit)
Service cost	$ 0.1	0.1	$ 0.2	0.2
Interest cost	9.7	8.5	18.1	18.3
Actuarial loss	0.9	1.7	0.9	1.7
Expected return on plan assets	(10.2)	(10.5)	(20.3)	(21.9)
Recognized net actuarial loss	4.8	4.8	9.4	9.2
Amortization of prior service cost (credit)	0.2	0.3	0.4	0.6
Recognized loss on settlements		41.4		41.4
Net periodic benefit cost (credit)	5.5	46.3	8.7	49.5
Int'l
Components of net periodic benefit cost (credit)
Service cost	4.5	3.5	8.8	6.9
Interest cost	3.5	4.2	6.9	8.3
Expected return on plan assets	(5.2)	(5.4)	(10.2)	(10.7)
Recognized net actuarial loss	2.6	1.8	5.2	3.6
Amortization of prior service cost (credit)	(0.1)	(0.1)	(0.2)	(0.2)
Net periodic benefit cost (credit)	5.3	4.0	10.5	7.9
U.S. Postretirement Health Benefits
Components of net periodic benefit cost (credit)
Interest cost	0.1		0.1	0.1
Recognized net actuarial loss	0.3	0.3	0.7	0.8
Amortization of prior service cost (credit)	(0.8)	(0.8)	(1.6)	(1.6)
Net periodic benefit cost (credit)	$ (0.4)	$ (0.5)	$ (0.8)	$ (0.7)