Leases ASC 842 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessor Disclosure [Abstract]
Rental and other revenues related to operating lease payments	$ 182.4	$ 181.1	$ 362.4	$ 370.7
Variable lease income	$ 14.5	$ 13.4	$ 29.0	$ 29.8
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