Pension and Other Post Retirement Plans (Details 3)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
U.S. qualified pension plan [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Allocations Minimum	50.00%
Allocations Maximum	80.00%
Total Target Allocation	100.00%	100.00%
U.S. qualified pension plan [Member] \| Real Estate Securities [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Allocations Minimum	0.00%
Actual Allocations	2.00%	2.00%
Allocations Maximum	7.00%
U.S. qualified pension plan [Member] \| U.S. Equities [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Allocations Minimum	20.00%
Actual Allocations	29.00%	29.00%
Allocations Maximum	50.00%
U.S. qualified pension plan [Member] \| International Equities [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Actual Allocations	4.00%	4.00%
U.K. pension plan [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Total Target Allocation	100.00%	100.00%
U.K. pension plan [Member] \| Other Securities [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Actual Allocations	5.00%	6.00%
U.K. pension plan [Member] \| Real Estate Securities [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Allocations Maximum	5.00%
U.K. pension plan [Member] \| Equity Securities UK Plan [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Actual Allocations	24.00%	34.00%
Allocations Maximum	35.00%
Debt Securities [Member] \| U.S. qualified pension plan [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Actual Allocations	65.00%	65.00%
Debt Securities [Member] \| U.K. pension plan [Member]
Defined Benefit Plan, Target Allocation Percentages of Assets, Equity Securities [Abstract]
Actual Allocations	71.00%	60.00%
Allocations Maximum	60.00%

-- None. No documentation exists for this element. --

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- References

No definition available.

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ 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 (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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