Leases - Aggregate Principal Payments (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
2019 (remaining)	$ 35.6
2020	38.8
2021	35.3
2022	30.4
2023	29.0
Thereafter	137.3
Total lease payments	306.4
Less: interest	(58.4)
Present value of lease liabilities	248.0
Finance Leases
2019 (remaining)	9.9
2020	13.3
2021	12.9
2022	12.3
2023	37.7
Thereafter	128.4
Total lease payments	214.5
Less: interest	(106.0)
Finance lease liability	108.5
Total
2019 (remaining)	45.5
2020	52.1
2021	48.2
2022	42.7
2023	66.7
Thereafter	265.7
Total lease payments	520.9
Less: interese	(164.4)
Present value of lease liability	$ 356.5