Quarterly Financial Data - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net discrete tax expense (benefits)	$ (0.3)	$ (0.2)	$ (0.1)	$ (1.5)	$ 0.1	$ 0.2	$ 2.8