Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension and other post-retirement plan contribution	$ 10.7			$ 10.7	$ 0.0
Actuarial gain		$ 12.2	$ 0.0	$ 12.2	$ 0.0