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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Defined Benefit Plan [Abstract]  
Schedule of Defined Benefit Plans Disclosures
 
U.S. Pension Benefits
 
Non-U.S. Pension Benefits
 
Other Benefits
 
Total
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Change in benefit obligation:
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Benefit obligation at beginning of year
$
142,571

 
$
138,155

 
$
918,478

 
$
838,277

 
$
2,673

 
$
2,985

 
$
1,063,722

 
$
979,417

Service cost, gross
1,090

 
565

 
30,721

 
29,600

 
—

 
—

 
31,811

 
30,165

Interest cost
4,242

 
4,374

 
8,630

 
8,511

 
66

 
70

 
12,938

 
12,955

Actuarial losses (gains)
(10,019
)
 
6,979

 
(40,469
)
 
33,036

 
(167
)
 
18

 
(50,655
)
 
40,033

Plan amendments and other
—

 
—

 
974

 
(15,153
)
 
(8
)
 
137

 
966

 
(15,016
)
Benefits paid
(7,682
)
 
(7,502
)
 
(36,379
)
 
(30,356
)
 
(378
)
 
(537
)
 
(44,439
)
 
(38,395
)
Impact of foreign currency
—

 
—

 
(17,860
)
 
54,563

 
—

 
—

 
(17,860
)
 
54,563

Benefit obligation at end of year
$
130,202

 
$
142,571

 
$
864,095

 
$
918,478

 
$
2,186

 
$
2,673

 
$
996,483

 
$
1,063,722

Change in plan assets:
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
Fair value of plan assets at beginning of year
$
111,567

 
$
104,103

 
$
808,215

 
$
716,169

 
$
—

 
$
—

 
$
919,782

 
$
820,272

Actual return on plan assets
(8,419
)
 
14,869

 
(34,102
)
 
49,055

 
—

 
—

 
(42,521
)
 
63,924

Employer contributions
75

 
97

 
26,032

 
22,961

 
227

 
400

 
26,334

 
23,458

Plan participants’ contributions
—

 
—

 
15,176

 
13,503

 
151

 
137

 
15,327

 
13,640

Benefits paid
(7,682
)
 
(7,502
)
 
(36,379
)
 
(30,356
)
 
(378
)
 
(537
)
 
(44,439
)
 
(38,395
)
Impact of foreign currency and other
—

 
—

 
(11,532
)
 
36,883

 
—

 
—

 
(11,532
)
 
36,883

Fair value of plan assets at end of year
$
95,541

 
$
111,567

 
$
767,410

 
$
808,215

 
$
—

 
$
—

 
$
862,951

 
$
919,782

Funded status
$
(34,661
)
 
$
(31,004
)
 
$
(96,685
)
 
$
(110,263
)
 
$
(2,186
)
 
$
(2,673
)
 
$
(133,532
)
 
$
(143,940
)
Schedule of Amounts Recognized in Balance Sheet
 
U.S. Pension Benefits
 
Non-U.S. Pension Benefits
 
Other Benefits
 
Total
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Other non-current assets
$
—

 
$
—

 
$
46,014

 
$
40,493

 
$
—

 
$
—

 
$
46,014

 
$
40,493

Accrued and other liabilities
(110
)
 
(88
)
 
(4,884
)
 
(4,990
)
 
(431
)
 
(411
)
 
(5,425
)
 
(5,489
)
Pension and other post-retirement liabilities
(34,551
)
 
(30,916
)
 
(137,815
)
 
(145,766
)
 
(1,755
)
 
(2,262
)
 
(174,121
)
 
(178,944
)
Accumulated other comprehensive loss (income)
61,344

 
61,819

 
260,820

 
254,870

 
(910
)
 
(2,365
)
 
321,254

 
314,324

Total
$
26,683

 
$
30,815

 
$
164,135

 
$
144,607

 
$
(3,096
)
 
$
(5,038
)
 
$
187,722

 
$
170,384
Schedule of Net Periodic Benefit Cost Not yet Recognized
 
U.S. Pension
Benefits
 
Non-U.S. Pension
Benefits
 
Other Benefits
 
Total
 
Total, After Tax
Plan amendments and prior service cost
$
—

 
$
(22,541
)
 
$
—

 
$
(22,541
)
 
$
(17,873
)
Actuarial losses (gains)
61,344

 
283,361

 
(910
)
 
343,795

 
266,332

Total
$
61,344

 
$
260,820

 
$
(910
)
 
$
321,254

 
$
248,459
Schedule of Changes in Accumulated Postemployment Benefit Obligations
 
U.S. Pension
Benefits
 
Non-U.S. Pension
Benefits
 
Other Benefits
 
Total
 
Total, After Tax
Net actuarial losses (gains)
$
5,329

 
$
24,637

 
$
(167
)
 
$
29,799

 
$
23,326

Plan amendment
—

 
974

 
—

 
974

 
780

Amortization of:
 
 
 
 
 
 


 
 
Actuarial (losses) gains
(5,804
)
 
(21,521
)
 
1,250

 
(26,075
)
 
(20,173
)
Plan amendments and prior service cost
—

 
6,947

 
372

 
7,319

 
5,807

Impact of foreign currency
—

 
(5,087
)
 
—

 
(5,087
)
 
(3,522
)
Total
$
(475
)
 
$
5,950

 
$
1,455

 
$
6,930

 
$
6,218
Schedule of Assumptions Used in Computing Benefit Obligation
 
U.S.
 
Non-U.S.
 
2018
 
2017
 
2018
 
2017
Discount rate
4.11
%
 
3.49
%
 
1.22
%
 
0.97
%
Compensation increase rate
n/a

 
n/a

 
0.87
%
 
0.87
%
Expected long-term rate of return on plan assets
6.50
%
 
6.50
%
 
3.84
%
 
3.86
%
Schedule of Assumptions Used in Computing Pension Cost
 
U.S.
 
Non-U.S.
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Discount rate
3.49
%
 
3.97
%
 
4.27
%
 
0.97
%
 
0.98
%
 
1.31
%
Compensation increase rate
n/a

 
n/a

 
n/a

 
0.87
%
 
0.85
%
 
1.03
%
Expected long-term rate of return on plan assets
6.50
%
 
6.75
%
 
7.25
%
 
3.86
%
 
4.09
%
 
4.58
%
Schedule of Net Benefit Costs [Table Text Block]
Net periodic pension cost and net periodic post-retirement benefit for the defined benefit plans and U.S. post-retirement plan include the following components for the years ended December 31:
 
U.S.
 
Non-U.S.
 
Other Benefits
 
Total
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Service cost, net
$
1,090

 
$
565

 
$
432

 
$
15,545

 
$
16,341

 
$
16,804

 
$
—

 
$
—

 
$
—

 
$
16,635

 
$
16,906

 
$
17,236

Interest cost on projected benefit obligations
4,242

 
4,374

 
4,428

 
8,630

 
8,511

 
10,664

 
66

 
70

 
76

 
12,938

 
12,955

 
15,168

Expected return on plan assets
(6,929
)
 
(6,737
)
 
(7,781
)
 
(31,005
)
 
(30,349
)
 
(33,168
)
 
—

 
—

 
—

 
(37,934
)
 
(37,086
)
 
(40,949
)
Recognition of actuarial losses/(gains) and prior service costs
5,804

 
6,556

 
7,606

 
14,575

 
16,247

 
12,923

 
(1,623
)
 
(2,674
)
 
(4,567
)
 
18,756

 
20,129

 
15,962

Settlement charge
—

 
—

 
7,963

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
7,963

Net periodic pension cost / (benefit)
$
4,207

 
$
4,758

 
$
12,648

 
$
7,745

 
$
10,750

 
$
7,223

 
$
(1,557
)
 
$
(2,604
)
 
$
(4,491
)
 
$
10,395

 
$
12,904

 
$
15,380
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year
 
U.S. Pension
Benefits
 
Non-U.S.
Pension Benefits
 
Other Benefits
 
Total
Plan amendments and prior service costs
$
—

 
$
(6,798
)
 
$
—

 
$
(6,798
)
Actuarial losses (gains)
2,374

 
21,630

 
(691
)
 
23,313

Total
$
2,374

 
$
14,832

 
$
(691
)
 
$
16,515
Schedule of Allocation of Plan Assets
 
December 31, 2018
 
December 31, 2017
 
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
 
Observable
Inputs for
Identical
Assets
(Level 2)
 
Unobservable
Inputs
(Level 3)
 
Total
 
Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
 
Observable
Inputs for
Identical
Assets
(Level 2)
 
Unobservable
Inputs
(Level 3)
 
Total
Asset Category:
 
 
 
 
 
 
 

 
 

 
 

 
 

 
 

Cash and Cash Equivalents
$
111,484

 
$
—

 
$
—

 
$
111,484

 
$
154,751

 
$
—

 
$
—

 
$
154,751

Equity Securities:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Mettler-Toledo Stock
2,436

 
—

 
—

 
2,436

 
3,154

 
—

 
—

 
3,154

Equity Mutual Funds:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

U.S.(1)
4,989

 
22,569

 
—

 
27,558

 
6,011

 
27,984

 
—

 
33,995

International(2)
68,544

 
45,892

 
—

 
114,436

 
80,836

 
61,341

 
—

 
142,177

Emerging Markets(3)
95,146

 
692

 
—

 
95,838

 
100,346

 
1,096

 
—

 
101,442

Fixed Income Securities:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Corporate/Government Bonds(4)
71,644

 
—

 
—

 
71,644

 
72,334

 
—

 
—

 
72,334

Fixed Income Mutual Funds:
 
 
 

 
 

 
 

 
 

 
 

 
 

 
 

Insurance Contracts(5)
—

 
22,852

 
1,461

 
24,313

 
—

 
23,421

 
1,514

 
24,935

Core Bond(6)
95,493

 
54,448

 
—

 
149,941

 
136,157

 
57,499

 
—

 
193,656

Real Asset Mutual Funds:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Real Estate(7)
83,879

 
13,838

 
—

 
97,717

 
79,218

 
8,836

 
—

 
88,054

Commodities(8)
40,267

 
—

 
—

 
40,267

 
37,302

 
—

 
—

 
37,302

Other Types of Investments:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Debt Securities (9)
38,616

 
—

 
—

 
38,616

 
—

 
—

 
—

 
—

Global Allocation Funds(10)
11,195

 
10,562

 
—

 
21,757

 
11,781

 
12,545

 
—

 
24,326

Insurance Linked Securities(11)
18,664

 
—

 
—

 
18,664

 
12,147

 
—

 
—

 
12,147

Total assets in fair value hierarchy
$
642,357

 
$
170,853

 
$
1,461

 
$
814,671

 
$
694,037

 
$
192,722

 
$
1,514

 
$
888,273

Investments measured at net asset value:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
International(2)
 
 
 
 
 
 
2,792
 
 
 
 
 
 
 
—

Emerging Markets (3)
 
 
 
 
 
 
4,889
 
 
 
 
 
 
 
5,950
Multi-Strategy Fund of Hedge Funds (12)
 
 
 
 
 
 
40,599
 
 
 
 
 
 
 
25,559
Total pension assets at fair value
 
 
 
 
 
 
$
862,951

 
 
 
 
 
 
 
$
919,782
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
 
Commodities
 
Insurance
Contract
 
Total
Balance at December 31, 2016
$
5,594

 
$
1,300

 
$
6,894

Actual return on plan assets related to assets held at end of year
—

 
21

 
21

Sales
(5,711
)
 
(98
)
 
(5,809
)
Purchases
—

 
108

 
108

Impact of foreign currency
117

 
183

 
300

Balance at December 31, 2017
$
—

 
$
1,514

 
$
1,514

Actual return on plan assets related to assets held at end of year
—

 
14

 
14

Sales
—

 
(85
)
 
(85
)
Purchases
—

 
82

 
82

Impact of foreign currency
—

 
(64
)
 
(64
)
Balance at December 31, 2018
$
—

 
$
1,461

 
$
1,461
Schedule of Expected Benefit Payments
 
U.S. Pension
Benefits
 
Non-U.S. Pension
Benefits
 
Other Benefits Net of
Subsidy
 
Total
2019
$
8,051

 
$
43,494

 
$
431

 
$
51,976

2020
8,247

 
43,111

 
249

 
51,607

2021
8,396

 
45,220

 
231

 
53,847

2022
8,546

 
43,543

 
207

 
52,296

2023
8,698

 
44,397

 
180

 
53,275

2024-2028
43,532

 
222,671

 
666

 
266,869