Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2005
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans		$ 949,000	$ 901,400
Post retirement medical benefit available to U.S. employees, change of age group, current range					under age 50
Age group for capping of retiree medical premium					age 50 and above
Percentage of defined benefit plan assets in U.S. and U.K.		98.00%
Change in percentage of broad asset class targets		10.00%
Pension and postretirement contributions		$ 13,341	$ 20,068	$ 21,613
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%
Transfers between fair value Level 1 and Level 2		$ 0
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to benefit plans in 2018		$ 13,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets		7.00%	7.00%	7.00%
Expected premium contribution		$ 3,000
Projected benefit obligation recognized		56,647	$ 56,141	$ 56,499
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to benefit plans in 2018		1,300
Costs (credits) related to supplemental executive retirement plan		2,600	1,600	$ (2,100)
Projected benefit obligation recognized		$ 24,800	$ 23,500
Subsequent Event | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	7.00%
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets		6.89%	6.89%	6.88%
Projected benefit obligation recognized		$ 685,963	$ 665,688	$ 682,839
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		$ 10,300	15,100	12,800
U.S. Plans | Employee Savings Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions		$ 11,300	$ 12,700	$ 11,700
U.S. Plans | Subsequent Event | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	6.89%
Foreign Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets		6.16%	6.66%	5.76%
Projected benefit obligation recognized		$ 275,006	$ 246,280	$ 245,747
Foreign Plans | Employee Savings Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions		$ 9,900	$ 9,500	$ 7,200
Foreign Plans | Subsequent Event | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	5.52%