Leases ASC 842 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lessor Disclosure [Abstract]
Rental and other revenues related to operating lease payments	$ 178.9	$ 184.2	$ 549.5	$ 534.2
Variable lease income	$ 12.8	$ 17.3	$ 42.7	$ 49.2
Minimum [Member]
Lessor Disclosure [Abstract]
Operating leases, term of leases (in years)	3 years		3 years
Maximum [Member]
Lessor Disclosure [Abstract]
Operating leases, term of leases (in years)	10 years		10 years