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Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On June 26, 2018, we entered into an agreement to purchase a group annuity contract to transfer approximately $68 million of our outstanding pension projected benefit obligations related to certain U.S. retirees or beneficiaries. The transaction closed on July 3, 2018 and was funded with pension plan assets with a value of $70.9 million. As a result of this transaction a pre-tax pension settlement charge of approximately $12.8 million will be recognized in the third quarter of 2018. This charge will be recorded in other (non-operating) expense on the Consolidated Statement of Operations.