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Employee Retirement Plans - Weighted Average Rate of Assumptions for Asset Allocation Plans (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Benefits increasing with RPI limited, percentage	5.00%
Discount rate	2.85%	3.75%
Rate of compensation increases (Merchant Navy Officers Pension Fund only)		4.55%
Rate of future RPI inflation	3.20%	3.05%
Rate of future CPI inflation	2.10%	1.95%
Pension increases in payment	3.05%	2.90%
Long-term rate of return on assets	3.17%	4.50%

X

- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Pension Increase

+ References

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- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Future Consumer Price Index Inflation

+ References

No definition available.

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- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Future Retail Price Index Inflation

+ References

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- Definition

Defined benefit plan assumptions used calculating net periodic benefit cost rate of pension increase.

+ References

No definition available.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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X

- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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