Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - Pension and Post-retirement Plan - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of Net Periodic Benefit Cost
Service cost	$ 200,000	$ 600,000	$ 400,000	$ 1,100,000
Interest cost	1,800,000	2,100,000	3,500,000	4,200,000
Expected return on plan assets	(1,700,000)	(1,800,000)	(3,400,000)	(3,600,000)
Amortization of net loss	600,000	1,000,000.0	1,200,000	2,000,000.0
Amortization of prior service credit	0	(200,000)	0	(300,000)
Net periodic benefit cost	900,000	$ 1,700,000	1,700,000	$ 3,400,000
Employer contributions			0
Expected contributions to be made in current year	$ 0		$ 0