Leases - Maturity of Lease Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Finance Lease, Liability, Payment, Due [Abstract]
2020	$ 16.8
2021	15.4
2022	11.0
2023	11.0
2024	11.0
Thereafter	40.0
Total minimum lease payments	105.2
Less: effect of discounting	19.3
Finance Lease, Liability, Total	85.9
Finance Lease, Liability, Current	(12.7)	$ (6.5)
Long-term lease obligations	73.2	$ 18.4
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	229.2
2021	194.0
2022	178.3
2023	159.2
2024	152.3
Thereafter	427.2
Total minimum lease payments	1,340.2
Less: effect of discounting	380.4
Operating Lease, Liability, Total	959.8
Operating Lease, Liability, Current	(160.0)
Long-term lease obligations	$ 799.8