Retirement Programs - Pension Plan Assets (Details) - Pensions	Dec. 31, 2020	Dec. 31, 2019
Equity Securities \| U.S.
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	66.00%	55.00%
Equity Securities \| U.S. \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	40.00%	40.00%
Equity Securities \| U.S. \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	60.00%	60.00%
Equity Securities \| International
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	27.00%	23.00%
Equity Securities \| International \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	15.00%	15.00%
Equity Securities \| International \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	25.00%	25.00%
Fixed Income Investments \| U.S.
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	27.00%	30.00%
Fixed Income Investments \| U.S. \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	30.00%	30.00%
Fixed Income Investments \| U.S. \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	50.00%	50.00%
Fixed Income Investments \| International
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	34.00%	41.00%
Fixed Income Investments \| International \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	30.00%	30.00%
Fixed Income Investments \| International \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	50.00%	50.00%
Other Investment \| U.S.
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	7.00%	15.00%
Other Investment \| U.S. \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	5.00%	5.00%
Other Investment \| U.S. \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	15.00%	15.00%
Other Investment \| International
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocation	39.00%	36.00%
Other Investment \| International \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	30.00%	30.00%
Other Investment \| International \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, target allocation, percentage	50.00%	50.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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