Leases - Maturities of Operating and Financing Lease Liabilities (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating Leases
2019	$ 7.9
2020	11.9
2021	9.3
2022	7.8
2023	7.4
Thereafter	15.7
Total lease payments	60.0
Less: imputed interest	(10.1)
Total present value of lease liabilities	49.9
Finance Leases
2019	1.5
2020	3.2
2021	3.2
2022	3.3
2023	3.3
Thereafter	57.3
Total lease payments	71.8
Less: imputed interest	(32.5)
Total present value of lease liabilities	$ 39.3