Lessee Arrangements - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease expense	$ 3.2	$ 3.3
Variable lease expense	1.1	1.2
Short-term lease expense	0.6	0.4
Total lease expense	$ 4.9	$ 4.9