Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Components of Net Periodic Benefit Cost
Net periodic benefit cost	$ 0.8	$ 1.7
Pension and Post-retirement Plan
Components of Net Periodic Benefit Cost
Service cost	0.2	0.5
Interest cost	1.7	2.1
Expected return on plan assets	(1.7)	(1.8)
Amortization of net loss	0.6	1.0
Amortization of prior service credit	$ 0.0	$ (0.1)