Commitments and Contingencies - Analysis of lease liability maturities, prior to ASC 842 adoption (Details) $ in Millions	Dec. 31, 2018 USD ($)
Operating Leases
2019	$ 10.4
2020	3.8
2021	3.4
2022	2.2
2023	1.5
Thereafter	4.1
Operating Leases	25.4
Capital and Facility Lease Obligations
2019	26.4
2020	28.4
2021	27.9
2022	7.0
2023	0.0
Thereafter	0.0
Capital and Facility Lease Obligations	$ 89.7