Leases - Contractual Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating Leases
2020	$ 50.4
2021	65.3
2022	47.7
2023	36.0
2024	30.0
Later years	121.0
Total lease payments	350.4
Less: Interest	(42.9)
Total lease liabilities	307.5	$ 307.9	$ 268.8
Finance Leases
2020	0.4
2021	0.5
2022	0.5
2023	0.5
2024	0.5
Later years	3.7
Total lease payments	6.1
Less: Interest	(0.9)
Total lease liabilities	$ 5.2	$ 5.3