Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands					12 Months Ended
	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017	Jan. 01, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans					$ 867,400	$ 949,000
Weighted-average expected rate of return on plan assets		6.73%	6.73%	6.85%
Actual rate of return					(4.55%)	14.31%	8.11%
Percentage of defined benefit plan assets in U.S. and U.K.					97.00%
Change in percentage of broad asset class targets					10.00%
Pension and postretirement contributions					$ 15,236	$ 13,341	$ 20,068
Assumed rate of increase in the pre-65 per capita cost of covered health care benefits for U.S. retirees					0.00%
Assumed rate of increase in the post-65 per capita cost of covered health care benefits for U.S. retirees					0.00%
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to benefit plans in 2019					$ 12,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets					7.00%	7.00%	7.00%
Discount rate					4.55%	3.99%
Expected premium contribution					$ 4,000
Projected benefit obligation recognized					50,390	$ 56,647	$ 56,141
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to benefit plans in 2019					1,300
Costs (credits) related to supplemental executive retirement plan					(800)	2,600	$ 1,600
Projected benefit obligation recognized					$ 21,900	$ 24,800
Foreign Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets					5.52%	6.16%	6.66%
Discount rate					2.15%	1.94%	2.00%	2.76%
Projected benefit obligation recognized					$ 240,303	$ 275,006	$ 246,280
Foreign Plans | Employee Savings Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions					$ 10,200	$ 9,900	$ 9,500
Foreign Plans | Subsequent Event | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	5.69%
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets					6.89%	6.89%	6.89%
Discount rate					4.59%	4.03%	4.43%	4.67%
Projected benefit obligation recognized					$ 635,866	$ 685,963	$ 665,688
Defined contribution plan, employer matching contribution percentage					5.00%
U.S. Plans | 2004 Defined Contribution Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions					$ 11,800	10,300	15,100
U.S. Plans | Employee Savings Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions					$ 12,700	$ 11,300	$ 12,700
U.S. Plans | Subsequent Event | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	6.89%