Leases - Maturities of Operating and Financing Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
2019	$ 11.8
2020	11.4
2021	7.2
2022	5.6
2023	5.2
Thereafter	11.7
Total lease payments	52.9
Less: imputed interest	(8.3)
Total present value of lease liabilities	44.6
Finance Leases
2019	2.3
2020	3.1
2021	3.2
2022	3.3
2023	3.3
Thereafter	57.3
Total lease payments	72.5
Less: imputed interest	(33.1)
Total present value of lease liabilities	$ 39.4