Lessee Arrangements - Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 3.0	$ 3.1	$ 6.2	$ 6.4
Variable lease expense	1.3	1.3	2.4	2.5
Short-term lease expense	0.8	0.5	1.4	0.9
Total lease expense	$ 5.1	$ 4.9	$ 10.0	$ 9.8