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Benefit Plans - Pension assumptions (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
US
Weighted average assumptions used to determine the company's obligations
Discount rate (as a percent)		4.38%	3.70%
Rate of compensation increase (as a percent)		4.31%	4.42%
Weighted average assumptions used to determine the company's net periodic benefit cost
Discount rate (as a percent)		3.70%	4.30%	4.30%
Expected long-term return on plan assets (as a percent)		5.30%	5.75%	5.75%
Rate of compensation increase (as a percent)		4.42%	4.54%	4.71%
US | Pro Forma
Weighted average assumptions used to determine the company's net periodic benefit cost
Expected long-term return on plan assets (as a percent)	5.30%
Non-US
Weighted average assumptions used to determine the company's obligations
Discount rate (as a percent)		4.33%	4.02%
Rate of compensation increase (as a percent)		3.63%	3.58%
Weighted average assumptions used to determine the company's net periodic benefit cost
Discount rate (as a percent)		4.02%	4.34%	4.57%
Expected long-term return on plan assets (as a percent)		4.31%	5.29%	5.41%
Rate of compensation increase (as a percent)		3.58%	3.62%	3.73%
Canada | Pro Forma
Weighted average assumptions used to determine the company's net periodic benefit cost
Expected long-term return on plan assets (as a percent)		3.86%

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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