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Employee Retirement Plans	6 Months Ended
Employee Retirement Plans	Jun. 30, 2019
Retirement Benefits [Abstract]
Employee Retirement Plans	Employee Retirement Plans Total employee retirement plan expense, which includes related administrative expenses, was $2.6 million and $5.3 million for the three and six months ended June 30, 2019, respectively. Total employee retirement plan expense was $2.6 million and $5.1 million for the three and six months ended June 30, 2018, respectively. Prior to the Separation, these costs were funded through intercompany transactions with Trinity. The Company participates in a multiemployer defined benefit plan under the terms of a collective-bargaining agreement that covers certain union-represented employees. The Company contributed $0.4 million and $0.9 million to the multiemployer plan for the three and six months ended June 30, 2019, respectively. The Company contributed $0.5 million and $1.1 million to the multiemployer plan for the three and six months ended June 30, 2018, respectively. Total contributions to the multiemployer plan for 2019 are expected to be approximately $1.9 million. In connection with the acquisition of ACG in December 2018, the Company assumed the assets and liabilities related to a defined benefit pension plan. Employer contributions for 2019 are not expected to be significant.