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Retirement Benefit Plans	6 Months Ended
Retirement Benefit Plans	Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Retirement Benefit Plans	12. Retirement Benefit Plans Our defined benefit pension plans and postretirement medical plan are described in Note 15 of our annual report on Form 10-K for the year ended December 31, 2018. We have contributed $0.1 million and $0.2 million during the second quarter of 2019 and $0.2 million and $0.4 million during the first six months of 2019 to our pension plans and postretirement medical plan, respectively. We contributed less than $0.1 million and $0.3 million during the second quarter of 2018 and $0.2 million and $0.6 million during the first six months of 2018 to our pension plans and postretirement medical plan, respectively. Net benefit costs for the three and six months ended June 30, 2019 and 2018 were not material.