Leases - Maturities of Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 23.8
2020	25.9
2021	19.2
2022	13.0
2023	10.9
Thereafter	22.0
Total lease payments	114.8
Less: imputed interest	14.9
Present value of lease liabilities	99.9
Finance Leases
Remainder of 2019	3.4
2020	5.5
2021	5.6
2022	5.7
2023	5.8
Thereafter	79.3
Total lease payments	105.3
Less: imputed interest	38.4
Present value of lease liabilities	$ 66.9