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Stock-based Compensation	6 Months Ended
Stock-based Compensation	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Stock-based Compensation On March 1, 2018, the Company granted 0.1 million performance stock units, 0.3 million restricted stock awards and 0.2 million restricted stock units under the 2015 Equity Incentive Plan. The performance stock units contain a three-year performance period with a performance target based on return on invested capital and possible payouts ranging from 50% to 200% of the target awards. The restricted stock awards and restricted stock units vest in equal annual increments over three years.