Leases - Schedule of Future Minimum Payments on Operating Leases (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 4.2
2020	4.6
2021	3.9
2022	3.7
2023	3.1
Thereafter	5.1
Total undiscounted lease payments	24.6
Less: present value adjustment	2.8
Operating lease liability	$ 21.8