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Retirement Benefits - Defined Benefit Pension Plan Amendments and Settlement (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Plan amendments and settlement
Pension settlement charge	$ 239,896
Defined Benefit Pension Plans | U.S.
Plan amendments and settlement
Pension settlement charge	250,946
Defined Benefit Pension Plans | U.S. | Total cost of revenue
Plan amendments and settlement
Pension settlement charge	11,000
Defined Benefit Pension Plans | U.S. | Pension settlement charge
Plan amendments and settlement
Pension settlement charge	$ 240,000

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

+ 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 (h)(7)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- References

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