Leases - Maturities of Lease Liabilities (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
2019 (remaining three months)	$ 2.0
2020	13.8
2021	10.6
2022	9.7
2023	9.7
Thereafter	45.1
Total lease payments	90.9
Less: interest	(19.8)
Total present value of lease liabilities	$ 71.1